JavaScript

超轻量级php框架startmvc

原生js实现鼠标跟随效果

更新时间:2020-04-25 21:20:01 作者:startmvc
话不多说,请看代码:<!DOCTYPEhtml><htmllang="en"><head><metacharset="UTF-8"><title&

话不多说,请看代码:


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>鼠标跟随效果</title>
 <style type="text/css">
 *{margin: 0;padding: 0;}
 img{position:absolute;top:0;left:0;}
 </style>
</head>
<body>
 <img src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=21984166dad229792b21c2e1277bece5" height="50" width="50" alt="" id="img">
</body>
<script type="text/javascript">
 (function(window){
 // 获取对象
 var img = document.getElementById("img");
 // 为页面添加单击事件,鼠标点击时图片滑动到鼠标所在位置
 document.onclick = function(event){
 var event = event || window.event;
 // 获取鼠标在页面上的坐标
 var pageX = event.pageX || event.clientX + document.documentElement.scrollLeft;
 var pageY = event.pageY || event.clientY + document.documentElement.scrollTop;
 // 减去图片自身宽高的一半,使鼠标在图片中间
 pageX = pageX - img.offsetWidth/2;
 pageY = pageY - img.offsetWidth/2;
 animate(img,{"left":pageX,"top":pageY});
 };
 // 封装缓动函数
 function animate(obj,json,fn){
 clearInterval(obj.timer);
 obj.timer = setInterval(function(){
 var flog = true ;
 for( k in json ){
 if( k === "zindex" ){
 obj.style[k] = json[k];
 }else if( k === "opacity" ){
 var leader = getStyle(obj,k) * 100;
 var target = json[k] * 100;
 var step = ( target - leader ) / 10 ;
 step = step > 0 ? Math.ceil( step ) : Math.floor( step );
 leader = leader + step ;
 obj.style[k] = leader / 100;
 }else{
 var leader = parseInt( getStyle(obj,k) );
 var target = json[k];
 var step = ( target - leader) / 10 ;
 step = step > 0 ? Math.ceil( step ) : Math.floor( step );
 leader = leader + step;
 obj.style[k] = leader + "px";
 };
 if( leader !== target ){
 flog = false;
 }
 }
 if( flog ){
 clearInterval(obj.timer);
 if( fn ){
 fn();
 };
 };
 }, 15)
 };
 // 封装获取计算后样式的函数
 function getStyle(obj,attr){
 if( window.getComputedStyle ){
 return window.getComputedStyle(obj,null)[attr];
 }else{
 return obj.currentStyle[attr];
 };
 };
 })(window)
</script>
</html>

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js鼠标跟随效果 鼠标跟随效果