本文实例讲述了AngularJS实现的回到顶部指令功能。分享给大家供大家参考，具体如下：
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="bootstrap.min.css" rel="external nofollow" >
<script src="jquery.min.js"></script>
<script src="angular.js"></script>
<script src="bootstrap.min.js"></script>
<style type="text/css">
#gotoTop {
display: none;
position: fixed;
top: 80%;
left: 90%;
cursor: pointer;
padding: 4px 4px;
width: 50px;
border: 1px solid #e0e0e0;
background: #fff;
border-radius: 50px;
height: 50px;
}
#gotoTop.hover {
background: #e0e0e0;
color: #fff;
text-decoration: none;
}
.arrow {
width: 0;
height: 0;
margin: 0 auto;
border: 9px solid transparent;
border-bottom-color: #aaa;
}
.stick {
width: 8px;
height: 14px;
margin: 0 auto;
border-radius: 1px;
background-color: #aaa;
}
</style>
<script type="text/javascript">
var myapp = angular.module('myapp', []);
myapp.directive("goToTop", function() {
return {
restrict: 'E',
replace: true,
scope: {
minHeight : '@'
},
templateUrl : 'tmpl.html',
link: function(scope, elem, attrs) {
elem.click(function() {
jQuery('html,body').animate({scrollTop:0}, 700);
})
.hover(function() {
jQuery(this).addClass("hover");
}, function() {
jQuery(this).removeClass("hover");
});
scope.minHeight = scope.minHeight ? scope.minHeight : 600;
jQuery(window).scroll(function() {
var s = jQuery(window).scrollTop();
if( s > scope.minHeight) {
jQuery("#gotoTop").fadeIn(100);
} else {
jQuery("#gotoTop").fadeOut(200);
};
});
}
};
});
</script>
</head>
<body ng-app="myapp">
<go-to-top min-height="800"></go-to-top>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
<h1>hello world</h1>
</body>
</html>
tmpl.html
<div id="gotoTop" title="返回顶部"> <div class="arrow"></div> <div class="stick"></div> </div>
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