rust源码

Ⅰ 为什么 node.js 的版本号更新得那么快

Node.js生态很活跃的啊，为什么就这么难招人？JavaScript语言规范都到2017了，Node.js版本也到v7.7了，正是无数专家学者，大公司，小公司和个人共同在推进这个开放的生态。Teambition作为一个创业公司，基于Node.js构建了我们的后端体系。我们从这个生态中受益良多，也在努力回馈这个生态。Node.js也很容易学啊，为什么就这么难招人？JS包括Node.js很容易学成上手。遥想12年时我就从零学起，半年时间就用Node.js和AngularJS做出了一套开源社区系统，至今还在运行。一般认为写Node.js的都是从前端转的，或者是后端新人，后端老手应该是不屑于Node.js的，这点我也认同。我本人前端、后端、JS、Golang、Rust都有写，目前主要在用Golang写后端，Node.js相关的项目也在继续推进。Node.js的优点是容易学容易出成果，因为它的开源生态好，很多东西拿来即用，想深入学习则直接看项目源码造轮子。缺点就是当项目足够庞大足够复杂了不太好维护。所以我认为Node.js是一门非常好的后端入门语言，也非常适合用来开发轻量级的应用服务。

Ⅱ 为何区块链被称为继互联网之后伟大的发明

区块链的发明是迎合宇宙空间扬升大趋势的需要。是提升国家和人民的诉求。是互联互通互学互助组网的基本结构性的点的需要。加上线性的需要，金字塔的立体化的需要，（宇宙空间三需要）！区块链是一个需要。一个基本点的需要。

Ⅲ 我为什么要选择Rust

你好，很高兴为你解答。
专访资深程序员庄晓立：我为什么要选择Rust？
Rust是由Mozilla开发的注重安全、性能和并发性的编程语言。这门语言自推出以来就得到了国内外程序员的大力推崇。Rust声称解决了传统C语言和C++语言几十年来饱受责难的内存安全问题，同时还保持了极高的运行效率、极深的底层控制、极广的应用范围。但在国内有关Rust的学习文档并不多见，不久前，笔者联系上了Rust1.0版本代码贡献者庄晓立（精彩博文：为什么我说Rust是靠谱的编程语言），请他分享Rust语言特性以及学习经验。
CSDN：你是从什么时候开始接触Rust语言的？是什么地方吸引了你？

庄晓立：我大概从2013年后半年开始深入接触Rust语言。它居然声称解决了传统C语言和C++语言几十年来饱受责难的内存安全问题，同时还保持了极高的运行效率、极深的底层控制、极广的应用范围。

其ownership机制令人眼前一亮，无虚拟机（VM）、无垃圾收集器（GC）、无运行时（Runtime）、无空指针/野指针/内存越界/缓冲区溢出/段错误、无数据竞争（Data Race）……所有这些，都深深地吸引了我——这个十多年以来深受C语言折磨的痛并快乐着的程序员。

CSDN：在你看来，Rust是怎样的一门语言？它适合开发什么类型的项目？为何你会说Rust不惧怕任何竞争对手，它既能取代C语言地位；又可挑战C++市场，还可向Java、Python分一杯羹？与这些语言相比，Rust有哪些优越的特性？

庄晓立：Rust是一门系统编程语言，特别适合开发对CPU和内存占用十分敏感的系统软件，例如虚拟机（VM）、容器（Container）、数据库/游戏/网络服务器、浏览器引擎、模拟器等，而这些向来主要都是C/C++的传统领地。

此外，Rust在系统底层开发领域，如裸金属（bare metal）、操作系统（OS）、内核（kernel）、内核模块（mod）等，也有强劲的实力，足以挑战此领域的传统老大C语言。Rust丰富的语言特性、先进的设计理念、便捷的项目管理，令它在上层应用开发中也能大展拳脚，至少在运行性能上比带VM和GC的语言要更胜一筹。无GC实现内存安全机制、无数据竞争的并发机制、无运行时开销的抽象机制，是Rust独特的优越特性。

其他语言很难同时实现这些目标，例如传统C/C++无法保证内存安全，Java/Python等无法消除运行时开销。但Rust毕竟还是很年轻的项目，它释放影响力需要时间，被世人广泛接受需要时间；它的潜力能否爆发出来，需要时间去检验。我们只需耐心等待。

CSDN：Rust在国内有没有具体的实际使用案例？

庄晓立：因为Rust1.0正式版刚刚发布不足一月，在国内影响力还不大，我们不能苛求它在国内有实际应用案例。但是在国外，一两年前就已经有OpenDNS和Skylight把Rust应用在生产环境。还有浏览器引擎Servo、Rust编译器和标准库、项目管理器Cargo等“两个半大型应用案例”。这些足够说明Rust语言的成熟和实用。

CSDN：你参与了Rust1.0版本代码贡献，目前该版本正式版已经发布，对此你感觉如何？这门语言是否已经达到比较成熟的阶段？

庄晓立：我积极参与了Rust语言开源项目，多次贡献源代码，曾连续三次出现在Rust官方博客公布的Rust 1.0 alpha、Rust 1.0 beta和Rust 1.0正式版的贡献者名单中。在Rust 1.0正式版出台的过程中及此前的很长一段时间，开发者付出了极大的努力，确保Rust 1.0正式版在Semver 2.0规范下，务必保持向后兼容性，除非遇到重大Bug不得不修复。

我认为，在1.0正式发布之后，Rust就已经进入了比较成熟的阶段。而且，Rust还在快速迭代发展过程中，1.0发布6周后将发布1.1，再6周后将发布1.2，必然会一步一个台阶，越来越成熟稳定。

CSDN：除了功能优先级以外，在你看来，Rust正在朝什么方向发展？未来的Rust可以期待什么样的特性？

庄晓立：Rust一定会沿着“确保内存安全、无运行开销、高效实用”的既定方向持续发展。在短期内值得期待的语言特性有：动态Drop、偏特化、继承、改进borrow checker、改进宏和语法扩展。短期内值得期待的其他特性有：增强文件系统API、提供内存申请释放API、更好地支持Windows和ARM、更快的编译速度、更方便的二进制分发机制（MUSL）、更实用的工具等等。

CSDN：据我了解，你之前也比较推崇Go语言，为何想到放弃Go转向Rust？

庄晓立：推崇Go语言还谈不上，不过我曾经尝试努力接受Go语言，2011底年开始我曾经花费将近半年时间深度关注Go开发进程，提了很多具体的改进意见和建议，也曾经多次尝试贡献源代码。后来考虑到Go语言的设计理念跟我偏差太大，其社区也不太友好，慢慢地疏远了它。我曾经写过一篇博客《我为什么放弃Go语言》，谈到了很多具体的原因。

CSDN：国内，参与Rust代码贡献的开发者多吗？有核心的人员吗？有哪些社区在维护Rust？

庄晓立：国内参与Rust代码贡献的开发者并不多，但也不少，官方的贡献者名单中也偶见几个貌似国人的名字。Rust的核心开发人员基本上都是Mozilla公司的员工，他们专职负责开发维护Rust语言和相关的项目，Rust社区也主要是他们参与组织和管理的。社区人员讨论主要集中在GitHub项目主页RFC/PR/Issue官方、Discuss论坛/IRC、Reddit、HN、StackOverflow等。

Ⅳ 源码安装的rust，怎么设置RUST

为什么不用 rustup 呢？多方便的工具啊。
你自己下载的话，自己去下源码包啊，或者 git clone。怎样都行，反正把源码拿到，然后把 RUST_SRC_PATH 变量设置过去就可以了。

Ⅳ Money spent on the brain is never spent in vain.

1,智力投资绝不会白花
英语名人名言- 美文赏析- 英语学习- 破釜沉舟: 源码下载,素材下载,为 ...
http://www.7880.com/Info/Article-edd8ac0.html

2,智力投资，决非虚掷。
东北电力大学第二频道BBS[旧版] :: 阅读主题- [分享]英文成语大全 ...
http://www2.ne.e.cn/forum/viewtopic.php?t=25386

3,用于教育的钱绝不是虚掷.
每日一句
http://www.lifesci.snnu.e.cn/s/html/2005-07/265.htm

4,智力上的投资绝非浪费。
LCES READER EZ GO | 名人谚语嘉言录PartM
http://sctlog.sctnet.e.tw/post/372/3793

你的作文：

Money spent on the brain is never spent in vain.

A number of thoughts concerning money from Charles Spurgeon. These thoughts have been taken from a number of his works.
The fourth evil is one to which I call your very earnest attention, the growth of wickedness in the land, especially in two forms, which we ought not to overlook. One is, the growing worldliness among professing Christians. They are inlging in extravagance in many ways; in luxurious habits, dress, equipages, feastings, and so on, and wasting the substance of which they are stewards. When a man is giving liberally to the cause of God, I count it very foolish to forbid his spending liberally in other ways, for men usually spend by scale. It would be absurd to hold up a wretched miser, who gives nothing either to God or man, as an example to a liberal spender; but there is too much of ostentatious extravagance abroad, which wastes the Master’s money in worldly pleasures and doubtful amusements, yea, and amusements worse than doubtful. Some, who are called ministers of Christ, have in these days even defended amusements which .moralists have felt bound to abandon, but let us hope that such ministers will not repeat the mistake. We must be careful, wise, and yet decided in our dealings with this growing evil, or we shall lose all spirituality from the churches. (An All Around Ministry: Addresses to Ministers and Students, (Page 68))
Every child of God is where God has placed him for some purpose, and the practical use of this first point is to lead you to inquire for what practical purpose has God placed each one of you where you now are? You have been wishing for another position where you could do something for Jesus: do not wish anything of the kind, but serve him where you are. If you are sitting at the King’s gate there is something for you to do there, and if you were on the queen’s throne, there would be something for you to do there; do not ask either to be gatekeeper or queen, but whichever you are, serve God therein. Brother, are you rich? God has made you a steward, take care that you are a good steward. Brother, are you poor? God has thrown you into a position where you will be the better able to give a word of sympathy to poor saints. Are you doing your allotted work? Do you live in a godly family? God has a motive for placing you in so happy a position. Are you in an ungodly house? You are a lamp hung up in a dark place; mind you shine there. Esther did well, because she acted as an Esther should, and Mordecai did well, because he acted as a Mordecai should. I like to think, as I look over you all,-God has put each one of them in the right place, even as a good captain well arranges the different parts of his army, and though we do not know his plan of battle, it will be seen ring the conflict that he has placed teach soldier where he should be. Our wisdom is not to desire another place, nor to judge those who are in another position, but each one being redeemed with the precious blood of Jesus, should consecrate himself fully to the Lord, and say, “Lord, what would thou have tine to do, for here I am, and by thy grace I am ready to do it.” Forget not then the fact that God in his providence places his servants in positions where he can make use of them.
God’s work is like a net of many meshes, and these are all connected with each other. We are links of the same chain, and cannot move without moving others. We are members of one body, and God acts towards us with that fact in view. He does not bless the hand for the hand’s sake, but for the sake of the whole body. Well then, dear friend, you are saved that you may save; you are taught that you may teach; you are confirmed in the faith that you may confirm others; talents are allotted to you that you may turn them over and bring in heavenly usury for your Lord. Whatever you nave is yours not to hoard for yourself, or to spend upon yourself, but that you may use it as a good steward of God. Who knoweth whether thou art come to the kingdom which God has given thee for such a time as this, when there is need of thee and all that thou hast?
Next, notice that the servants of God--whether called ministers or not,- those who are really so, are stewards because they are under the Master’s near command. An ordinary servant in God’s house may take his orders from the steward, but the steward takes no order from anybody but the Master; and hence, he is in an evil case, and the household is in an evil case, too, if he does not often resort to the Master, if he does not distinctly recognize his position as an underling of his Master, and if he does not so keep up his daily fellowship with the Master that he himself knows the Master’s mind, and is able to communicate it to his fellow-servants.
The real steward is one who has been appointed to the position; and if he is not appointed, why, he has no right to be a steward at all! Things go right when there is no absentee landlord, but when the great Master is always close at hand, and the steward constantly goes to him with an account of all his work. The steward keeps his master’s stores, and sees that they are not wasted; but he takes care also to magnify his master’s liberality by seeing that none of the household know any want. I have known some who pretended to be stewards of Christ who evidently did not understand the business.
First, give an account of the stewardship of thy time. How hast thou spent it? Have not many hours been allowed to run to waste, or worse than waste, in frivolity and sin? Hast thou lived as a dying man should live? Hast thou employed thine hours as remembering that they are very few, and more precious than the diamonds in an emperor’s crown? What about thy time? Has there not been much of it spent in indolence, in frothy talk, or that did not minister to edification? Thou needest not accuse thyself for time spent in lawful recreation that may sustain thy body, and fit it better for the Lord’s service.
But, after all, to every man, whether he be rich, or whether he be in the office of the ministry, there may be a close of his stewardship before he dies. The mother has her little children swept away one after another; this is the message to her, “Thou mayest be no longer steward.” The teacher has his class scattered, or he is himself unable to go to the school; the word to him also is, “Thou mayest be no longer steward.” The man who went to his work, who might have spoken to his fellow-workman, is removed, perhaps to another land, or he is placed in a position where his mouth is shut; now he can be no longer steward. Use all opportunities while you have them, catch them on the wing, serve God while you can today! today! today! today! Let each golden moment have its pressing service rendered unto God, lest it should be said to thee, “Thou mayest be no longer steward.”
Now, as Peter found this prayer so suitable for him, I commend it to each one of you. Have; you been growing rich lately? Then, you will be tempted to become proud and worldly; so pray, “Lord, save me from the evils that, so often go, with riches; thou art giving me this wealth, help me to be a good steward of it, and not to make, an idol of it.” Or are you getting poor? Is your business proving a failure? Are your little savings almost gone? Well, there are perils connected with poverty; so pray, “Lord, save me from becoming envious or discontented; let me be willing to be poor rather than do anything wrong in order to get money.”
First, a steward is a servant, and no more. Perhaps he does not always remember this; and it is a very pitiful Business when the servant begins to think that he is “my lord.” It is a pity that servants when honored by their master should be so apt to give themselves airs. How ridiculous Jack-inoffice makes himself! I do not refer now to butlers and footmen, but to ourselves. If we magnify ourselves, we shall become contemptible, and we shall neither magnify our office nor our Lord. We are the servants of Christ, and not lords over his heritage.
My friend, keep money in thy purse: “It is one of Solomon’s proverbs,” said one; another answered that it was not there. “Then,” said Kit Lancaster, “it might have been, and if Solomon had ever known the miss of a shilling he would have said it seven times over.” I think that he does say as much as this in substance, if not in so many words, especially when he talks about the ant; but be that how it may, be sure of this, that a pound in the pocket is as good as a friend at court, and rather better; and if ever you live to want what you once wasted, it will fill you with woe enough to last you to your grave. He who put a pound of butter on a gridiron, not only lost his butter, but made such a blaze as he won’t soon forget: foolish lavishness leads to dreadful wickedness, so John Ploughman begs all his mates to fight shy of it, and post off to the Post Office Savings’ Bank. “For age and want save while you may; No morning’s sun lasts all the day.” Money is not the chief thing, it is as far below the grace of God and faith in Christ as a ploughed field is below the stars; but still, godliness hath the promise of the life that now is; as well as of that which is to come, and he who is wise enough to seek first the kingdom of God and his righteousness, should also be wise enough to use aright the other things which God is pleased to add unto him.
“Blessed shall be thy basket and thy store” Deuteronomy 28:5 Obedience brings a blessing on all the provisions which our instry earns for us. That which comes in and goes out at once, like fruit in the basket which is for immediate use, shall be blest; and that which is laid by with us for a longer season shall equally receive a blessing. Perhaps ours is a handbasket portion. We have a little for breakfast, and a scanty bite for dinner in a basket when we go out to do our work in the morning. This is well, for the blessing of God is promised to the basket. If we live from hand to mouth, getting each day’s supply in the day, we are as well off as Israel; for when the Lord entertained His favored people He Only gave them a day’s manna at a time. What more did they need? What more do we need? But if we have a store, how much we need the Lord to bless it! For there is the care of getting, the care of keeping, the care of managing, the care of using; and, unless the Lord bless it, these cares will eat into our hearts, till our goods become our gods, and our cares prove cankers. O Lord, bless our substance. Enable us to use it for thy glory. Help us to keep worldly things in their proper places, and never may our savings endanger the saving of our souls.
Don’t put all your eggs into one basket. It is unwise to risk all that you have in any one concern. If you have any savings, put them in several places. The marine form of this saying is: “Do not ship all your goods in one vessel.”
Many can get money; few can use it well. Even to keep it is not easy. Many of the silliest investments have been made by men who, in their own business, were shrewd to the highest degree. It is harder to weave than to gather wool.
Many save their silver, but lose their souls. Many a man’s soul has been ruined by his great love of money, although he had but little money to love.
Money borrowed is soon sorrowed. He that lends it begins to sorrow, even if the borrower does not; for, in general, he may mourn that he has parted from it to meet no more.
Money burns many. They are injured by their wealth. Some by bribes are burned; for when money’s taken, Freedom’s forsaken.
Money calls, but does not stay; It is round and rolls away. It makes the mill to go, but it goes faster than the mill-wheel. It is no more to be kept in the purse than snow in an oven; at least, so I find it. But why should we wish it to stay? It is the circulating medium! why should we detain it? If it rests it rusts. Let it go about doing good.
Money gained on Sabbath-day is a loss, I dare to say. No blessing can come with that which comes to us, on the devil’s back, by our willful disobedience of God’s law. The loss of health by neglect of rest, and the loss of soul by neglect of hearing the gospel, soon turn all seeming profit into real loss.
Money gilds over guilt. Money is said to be a composition for taking out stains in character; but, in that capacity, it is a failure. Those characters which can be thus gilded must surely be of the gingerbread order.
Money has no blood relations. There is no friendship in business. Sad that this should be a proverb in any land, but so it is. The Chinese say: “Though brothers are closely akin, it is each for himself in money matters.” They also say: “Top and bottom teeth sometimes come into awkward collision.” So little power has relationship in the savage customs of business that, in some instances, one hand would skin the other, if it could make a profit by it.
Money is a good servant, but a bad master. Even as a servant it is not easy to keep it in e subordination. If “money makes dogs dance,” it makes men proud. If we make money our god, it will rule us like the devil.
Money is often lost for want of money. It is so when men cannot get their rights, from inability to pay legal charges. Yet if one had plenty of cash, it would not be wise to throw away good money after bad, Money is the best t to fish for man with. He bites greedily at a gold or silver t: but is the creature which is thus taken worth the catching? He who can be bought, I think is worth nought.
Money is the servant of the wise, and the master of fools. Money makes money. The goose that lays the golden eggs likes to lay where there are eggs already; perhaps because it is a goose. The lard comes to the fat; hog. Capital grows by interest, or by wise use it brings in profit, and thus increases.
Money is money’s brother. “If riches increase, set not your heart upon them.” — Psalm 62:10. Money makes the mare to go and the dog to dance. Pecuniae obediunt omnia.” All things obey money.” This saying comes from the Latin, but it is true in English. A little palm oil will gain entrance where nothing else will do it. Officials are greatly mollified when their hands are, crossed with silver. In a more allowable sense, a good wife would be happier and more active if her allowance could be increased. If she has too little money to keep house upon, it takes the “go” out of her. Money often unmakes the men who make it. It has a defiling and degrading power over the mind which thinks too much of it. “Money and men a mutual falsehood show; Men make false money; money makes men so.”
Money speaks more powerfully than eloquence. Too often, because the speaker is a rich man he commands attention, and secures the approbation of persons who see no sound sense spoken by one who has no money bags. This is very well put in the following verse: — The man of means is eloquent: Brave, handsome, noble, wise; All qualities with gold are, sent, And vanish where it flies.
Money spent on the brain is never spent in vain. Pour your money into your brain, and you will never lose it all. Ecation is such a gain, that it is worth all that it costs, and more. Yet some fellows learn nothing in the schools. Many a father, when his son returns from the University, might say, “I put in gold into the furnace, and there came out this calf.”
Money will make the pot boil, though the devil should pour water on the fire. But such fuel is not to be depended on. We need something better than mere money to keep our pot a-boiling. Such boiling is apt to scald a man sooner or later.
Money wins where merit fails. It is a pity it should be so; but, with worldly minds, to be rich is to be good. This vulgar error is long in dying. “The boy in yellow wins the day.” Canaries are still the favorite birds.
A hammer of gold will not open the gate of heaven. Money opens many of the gates of earth, for bribery is rife; but it has no power in the world to come. Money is more eloquent than ten members of parliament, but it cannot prevail with the Great Judge.
Better a purse empty than full of other men’s money. Gaining riches by chicanery is drawing down a curse upon ourselves. Honorable poverty is infinitely to be preferred to dishonest wealth, or to large indebtedness. In the Telugu we read: “A cupful of rice-water without debt is enough.”

Do good with your money, or it will do you no good. There is no power in it of itself to do real good to you. It may even do you evil; but, if used for God and his cause, and the poor, it will bless yourself.

总参考：

http://www.google.com/search?num=50&hl=zh-CN&newwindow=1&q=Money+spent+on+the+brain+is+never+spent+in+vain.&lr=

Ⅵ 玉溪电脑培训学校告诉你C语言编程技术的优势和劣势

随着互联网编程技术的不断发展，现在大多数的软件开发都是通过编程语言来实现的，今天我们就一起来了解一下C语言编程开发技术都有哪些优势和劣势。

C语言的一些好的体验

一次通过阅读POV-Ray源代码学会如何在C语言中实现面向对象编程。

通过阅读GTK+源代码了解C语言代码的清晰、干净和可维护性。

通过阅读SIOD和Guile的源代码，知道如何使用C语言实现Scheme解析器。

使用C语言写出GNOMEEye的初始版本，并对MicroTile渲染进行调优。

C语言的一些不好的体验

在Evolution团队时，很多东西老是崩溃。那个时候还没有Valgrind，为了得到Purify这个软件，需要购买一台Solaris机器。

调试gnome-vfs线程死锁问题。

调试Mesa，却无果。

接手Nautilus-share的初始版本，却发现代码里面居然没有使用free()。

想要重构代码，却不知道该如何管理好内存。

想要打包代码，却发现到处是全局变量，而且没有静态函数。

但不管怎样，还是来说说那些Rust里有但C语言里没有的东西吧。

自动资源管理

Rust从C++那里借鉴了一些想法，如RAII(，资源获取即初始化)和智能指针，并加入了值的单一所有权原则，还提供了自动化的决策性资源管理机制。

自动化：不需要手动调用free()。内存使用完后会自动释放，文件使用完后会自动关闭，互斥锁在作用域之外会自动释放。如果要封装外部资源，基本上只要实现Drop这个trait就可以了。封装过的资源就像是编程语言的一部分，因为你不需要去管理它的生命周期。

决策性：资源被创建(内存分配、初始化、打开文件等)，然后在作用域之外被销毁。根本不存在垃圾收集这回事：代码执行完就都结束了。程序数据的生命周期看起来就像是函数调用树。

如果在写代码时老是忘记调用这些方法(free/close/destroy)，或者发现以前写的代码已经忘记调用，甚至错误地调用，那么以后我再也不想使用这些方法了。

泛型

Vec真的就是元素T的vector，而不只是对象指针的数组。在经过编译之后，它只能用来存放类型T的对象。

在C语言里需要些很多代码才能实现类似的功能，所以我不想再这么干了。

trait不只是interface

Rust并不是一门类似那样的面向对象编程语言，它有trait，看起来就像是里的interface——可以用来实现动态绑定。如果一个对象实现了Drawable，那么就可以肯定该对象带有draw()方法。

不过不管怎样，trait的威力可不止这些。

依赖管理

以前实现依赖管理需要：

手动调用或通过自动化工具宏来调用g-config。

指定头文件和库文件路径。

基本上需要人为确保安装了正确版本的库文件。

而在Rust里，只需要编写一个Cargo.toml文件，然后在文件里指明依赖库的版本。这些依赖库会被自动下载下来，或者从某个指定的地方获取。

测试

C语言的单元测试非常困难，原因如下：

内部函数通常都是静态的。也就是说，它们无法被外部文件调用。测试程序需要使用#include指令把源文件包含进来，或者使用#ifdefs在测试过程中移除这些静态函数。

需要编写Makefile文件将测试程序链接到其中的部分依赖库或部分代码。

需要使用测试框架，并把测试用例注册到框架上，还要学会如何使用这些框架。

卫生宏(HygienicMacro)

Rust的卫生宏避免了C语言宏可能存在的问题，比如宏中的一些东西会掩盖掉代码里的标识符。Rust并不要求宏中所有的符号都必须使用括号，比如max(5+3,4)。

没有自动转型

在C语言里，玉溪北大青鸟http://www.kmbdqn.cn/发现很多bug都是因为在无意中将int转成short或char而导致，而在Rust里就不会出现这种情况，因为它要求显示转型。

不会出现整型溢出

这个就不用再多作解释了。

Ⅶ windows 7 下Rust 入门 Helloworld 怎么编写

方法/步骤
1、首先要在 电脑上安装 rust 语言，具体可参考
0windows7怎么安装 rust
2、打开一个编辑器，我用的是 Notepad ++ ，其他也可以，建议初学 最好用 文本编辑器，不要用什么IDE
3、输入代码：
// This is a comment, and will be ignored by the compiler
// 本行为注释，会被编译器忽略
// This is the main function
// 这是主函数
fn main() {

println!("Hello World!");
}
windows 7 下Rust 入门 Helloworld 怎么编写
4、输入无误后，保存为 "hello.rs", 注意文件后缀是 .rs
windows 7 下Rust 入门 Helloworld 怎么编写
5、打开一个 COMMAND, 转到 文件保存目录，输入 rustc hello.rs,回车。
windows 7 下Rust 入门 Helloworld 怎么编写
6、如果源代码没有写错的话，就会生成 hello.exe 文件
windows 7 下Rust 入门 Helloworld 怎么编写
7、验证结果 ，在COMMAND 中 直接 输入 hello.exe
如果 显示 hello world，表示编写成功
windows 7 下Rust 入门 Helloworld 怎么编写
8、rust 编程还是比较简单容易上手的。

Ⅷ 现实中程序员是怎样飞快敲代码的

敲代码很快有几个条件

1.对项目代码和结构非常熟悉，知道整个数据流的在代码中的流动过程和变化过程。知道当前新增的代码在整个项目处于哪个位置，对于数据会有产生什么新的变化。这些要心理有数。也就是从架构层面去思考代码的编写。

2.对于需求理解的很透。这样业务逻辑转成代码逻辑就不会有任何不清楚的地方。

3.已经解决了技术难点，也就是说前期测试性代码已经写过了弄清楚了，避免了突然出现的技术性难点

4.新增的代码和新增的数据结构已经仔细思考过了，并设计好。也清楚引入这些新的代码和数据结构对现有代码的整体影响

5.异常点的位置的处理方案已经安排好了。写代码一部分是正常业务流程，算法过程，但是另外一大块就是处理各种异常。当异常出现之后，是代码重试，报错后忽略，还是报错之后停止代码，还是报错后清理代码并重新恢复上一个状态，等等。这些都是要心理有数。

6.对于如何新增源代码文件，命名函数，命名文件名，命名类名，命名变量名有一整套方案。有时候想个函数名或者变量名都要卡好几分钟，就不算飞快了。别笑，想个变量名，网络十来分钟的时候多了去了。

7.外部环境已经准备好了。IDE稳定，数据库结构稳定，数据稳定，网络稳定，访问网页顺畅，准备好免打扰的牌子。准备好刷卡提需求的二维码，准备好板砖和大刀，预防产品经理提需求和改需求。

Ⅸ linux rustup 没有

1：如果包是通过yum或者rpm方式安装 rpm -qa 包的名字 2：如果是源码编译安装 ps -aux 文件名 3.简单粗暴的方法 find / -name *文件名*

Ⅹ Ajax技术是否封装了JDBC访问数据库的代码

ajax无法封装到JDBC代码。
【1】ajax是客户端的控制技术，用来控制浏览器中某（IE是XMLHttpRequest）插件，这个插件是负责通信的，也就是说ajax是通过控制这个插件来实现通信控制的。
【2】JDBC是服务器端的数据库访问技术，而ajax是客户端的通信控制技术，两者相差甚远，没有关系，这样ajax是无法封装JDBC的，再说ajax是使用Javascript语言的，是过程性语言，而封装是面向对象语言的术语，两者的差别很大。
【3】不过可以使用ajax来“访问“到JDBC代码。它也不过能够提交请求和接收服务器反馈（可以进行一定处理），其他的它鞭长莫及。