node.js 在 nodejs 项目中使用 es6 类的正确方法
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proper way of using es6 classes in a nodejs project
提问by ufk
I'd like to be able to use the cool es6 classes feature of nodejs 4.1.2
我希望能够使用 nodejs 4.1.2 的酷 es6 类功能
I created the following project:
我创建了以下项目：
a.js:
a.js：
class a {
constructor(test) {
a.test=test;
}
}
index.js:
索引.js：
require('./a.js');
var b = new a(5);
as you can see I create a simple class that it's constructor gets a parameter. and in my include i require that class and create a new object based on that class. pretty simple.. but still i'm getting the following error:
如您所见，我创建了一个简单的类，它的构造函数获取一个参数。在我的包含中，我需要该类并基于该类创建一个新对象。很简单..但我仍然收到以下错误：
SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:413:25)
at Object.Module._extensions..js (module.js:452:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object.<anonymous> (/Users/ufk/work-projects/bingo/server/bingo-tiny/index.js:1:63)
at Module._compile (module.js:434:26)
at Object.Module._extensions..js (module.js:452:10)
any ideas why ?
任何想法为什么？
回答by smirnov
Or you can run like this:
或者你可以像这样运行：
node --use_strict index.js
node --use_strict index.js
回答by ufk
i'm still confused about why 'use strict' is needed, but this is the code that works:
我仍然对为什么需要“严格使用”感到困惑，但这是有效的代码：
index.js:
索引.js：
"use strict";
var a = require('./a.js');
var b = new a(5);
a.js:
a.js：
"use strict";
class a {
constructor(test) {
a.test=test;
}
}
module.exports=a;
