這其實是一個很簡單的問題，如果你認真查看過Angular官方的API文檔，本來不想記錄的。但是這個問題不止一次的被人問起，所以今天在記錄在這裏。
在Angular中已經對一些ng事件如ngClick,ngBlur,ngCopy,ngCut,ngDblclick...中加入了一個變量叫做$event.
如ngClick在官方文檔是這麼描述的：
Expression to evaluate upon click. (Event object is available as $event)
在查看Angular代碼[ngEventDirs.js](https://github.com/angular/angular.js/blob/a68624444afcb9e3796b1a751cf3817cafd20240/src/ng/directive/ngEventDirs.js):
var ngEventDirectives = {};
forEach(
'click dblclick mousedown mouseup mouseover mouseout mousemove mouseenter mouseleave keydown keyup keypress submit focus blur copy cut paste'.split(' '),
function(name) {
var directiveName = directiveNormalize('ng-' + name);
ngEventDirectives[directiveName] = ['$parse', function($parse) {
return {
compile: function($element, attr) {
var fn = $parse(attr[directiveName]);
return function(scope, element, attr) {
element.on(lowercase(name), function(event) {
scope.$apply(function() {
fn(scope, {$event:event});
});
});
};
}
};
}];
}
);在上邊代碼我們可以得到兩個信息：
1. Angular支持的event： click dblclick mousedown mouseup mouseover mouseout mousemove mouseenter mouseleave keydown keyup keypress submit focus blur copy cut paste
2. Angular在執行事件函數時候傳入了一個名叫$event的常量，該常量即代表當前event對象，如果你在Angular之前引入了jQuery那麼這就是jQuery的event.
所以我們可以利用event的stopPropagation來阻止事件的冒泡：如下代碼：[jsbin](http://jsbin.com/delow/3/watch?html,js,output)
html 代碼
<!DOCTYPE html>
<html id="ng-app" ng-app="app">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.1.5/angular.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body ng-controller="demo as d">
<div ng-click="d.click('parent',$event)">
given some text for click
<hr>
<input type="checkbox" ng-model="d.stopPropagation" />Stop Propagation ?
<hr>
<button type="button" ng-click="d.click('button',$event)">button</button>
</div>
</body>
</html>js 代碼
angular.module("app",[])
.controller("demo",[function(){
var vm = this;
vm.click = function(name,$event){
console.log(name +" -----called");
if(vm.stopPropagation){
$event.stopPropagation();
}
};
return vm;
}]);可以在jsbin](http://jsbin.com/delow/3/watch?html,js,output)查看效果。
首先打開你的控制檯，然在沒選中Stop Propagation的情況下點擊button你將會看見兩條log記錄，相反選中後則只會出現button的log信息。
希望大家已經明白了，不要再問這類問題了。