现在我如何编写和测试ECMAScript 6代码? [英] How can I write and test ECMAScript 6 code now?
问题描述
我想开始使用即将到来的ECMAScript 6(ES6)编写代码,以便开始掌握新的语法。
I would like to start writing code using the up and coming ECMAScript 6 (ES6) so as to start getting to grips with the new syntax.
是否有一些我可以使用一些网络资源或浏览器插件来播放(编写和测试代码)关于我们目前对ES6的看法?
Is there some kind of web resource or browser plugin that I can use to play (write and test code) on what we currently have in regards to ES6?
我率先相信使用Google Chrome Canary可能有帮助。所以我下载了Canary,我启用了金丝雀的几个功能:
I was lead to believe that using Google Chrome Canary might be able to help. So I downloaded Canary, I enabled a couple of features in Canary:
启用实验JavaScript (Mac,Windows ,Linux,Chrome OS,Android)
Enable Experimental JavaScript (Mac, Windows, Linux, Chrome OS, Android)
启用网页以使用实验性JavaScript功能。
#enable-javascript -harmony 启用
Enable web pages to use experimental JavaScript features.
#enable-javascript-harmony Enable
测试让
在for循环中阻止范围
And after testing the let
block scope in a for loop
for (let i = 0; i < 10; i++) {
console.log(i);
}
我有一个语法错误:
SyntaxError:意外的标识符
SyntaxError: Unexpected identifier
推荐答案
以下内容在Chrome 37(当前Chrome)中启用了实验JavaScript标志:
The following works in Chrome 37 (current Chrome) with the Experimental JavaScript flag enabled:
(function () {
"use strict";
for (let i = 0; i < 10; i++) {
console.log(i);
}
})()
在严格模式之外,您应该看到 SyntaxError:非法的扩展模式下的声明
或 SyntaxError:意外的标识符
如果您不在严格模式,或可能 SyntaxError:意外严格模式保留字
如果实验JavaScript标志未启用。
Outside strict mode, you should see SyntaxError: Illegal let declaration outside extended mode
or SyntaxError: Unexpected identifier
if you're not in strict mode, or possibly SyntaxError: Unexpected strict mode reserved word
if the Experimental JavaScript flag is not enabled.
您还可以使用 Babel 或使用 Traceur和 - 阻止绑定
标志启用。
You can also compile your code with with Babel or with Traceur and the --block-binding
flag enabled.
请参阅 kangax的ES6兼容表了解更多。
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