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使用g-class 动态设置元素的类，方法是绑定一个代表所有需要添加的类的表达式。重复的类不会添加。当表达式发生变化，先前添加的类会被移除，新类会被添加。
<!doctype html>
<html ng-app="myApp">
<head>
<link rel="stylesheet" href="//cdn.jsdelivr.net/foundation/4.3.2/css/foundation.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0-rc.2/angular.js"></script>
</head>
<body>
<div ng-controller="LotteryController">
<div ng-class="{red: x > 5}" ng-if="x > 5">
You won!
</div>
<button ng-click="x = generateNumber()" ng-init="x = 0">Draw Number</button>
<p>Number is: {{ x }}</p>
</div>
</body>
</html>
.red {
background-color: red;
}
angular.module(‘myApp‘, [])
.controller(‘LotteryController‘, function($scope) {
$scope.generateNumber = function() {
return Math.floor((Math.random()*10)+1);
};
});
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原文地址：http://www.cnblogs.com/ByronWu12345/p/4853310.html
