[英]Strange AngularJS beginner behavior
I am starting learning AngularJS but I've stumbled across a strange behavior I can't quite understand where the (() => {}) notation is not equivalent to (function(){}). 我开始学习AngularJS,但偶然发现了一个奇怪的行为,我不太了解(()=> {})表示法在什么地方不等同于(function(){})。
My index.html: 我的index.html:
<!DOCTYPE html>
<html ng-app="gemStore">
<head>
<title>AngularJS Store</title>
<script src="./angular.min.js"></script>
<script src="./app.js"></script>
</head>
<body>
<div ng-controller="StoreController as store">
<h1>{{store.product.name}}</h1>
<h2>${{store.product.price}}</h2>
<p>{{store.product.description}}</p>
</div>
</body>
</html>
My app.js (closure stripped for debugging). 我的app.js(关闭了用于调试的外壳)。
var app = angular.module('gemStore', []);
app.controller("StoreController", function() {
this.product = gem;
});
var gem = {
name: 'Dodecahedron',
price: 2.95,
description: '. . .'
};
In app.js, if I change 在app.js中,如果我更改
app.controller("StoreController", function() {
this.product = gem;
});
to 至
app.controller("StoreController", () => {
this.product = gem;
});
My page no longer displays the gem information(just blanks and the dollar sign remain). 我的页面不再显示宝石信息(仅保留空白和美元符号)。
Can somebody explain why this happens? 有人可以解释为什么会这样吗?
AngularJS version: v1.5.6 AngularJS版本:v1.5.6
Opera version: 37.0.2178.54 Opera版本:37.0.2178.54
You shouldn't use arrow functions if you need this
context. 如果需要this
上下文,则不应使用箭头功能。
Read more here(13.2): http://exploringjs.com/es6/ch_arrow-functions.html 在此处(13.2)了解更多信息: http : //exploringjs.com/es6/ch_arrow-functions.html
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