ng-src和ng-href等同于html中的src和href，只是ng是在dom加载完毕之后才能够发挥作用，如果在src或href中绑定变量，如果ng没有加载完，会导致链接地址出错，如果用对应的ng-src或ng-href，则不会出现这个问题。下面是一段示例代码：
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<meta charset="UTF-8">
<title>interval</title>
<script type="text/javascript" src="angular.min.js" charset="utf-8"></script>
</head>
<body ng-controller="ctrl">
<div><a ng-href="NewFile3_{{i}}.htm">链接</a></div>
<div><input type="button" ng-click="clickEvent(1)" value="切换链接1" /><input type="button" ng-click="clickEvent(2)" value="切换链接2" /><input type="button" ng-click="clickEvent(3)" value="切换链接3" /></div>
<script type="text/javascript">
var myApp = angular.module('myApp',[]);
myApp.controller('ctrl', function($scope){
$scope.i = 1;
$scope.clickEvent = function(index) {
$scope.i = index;
}
});
</script>
</body>
</html>