js实现交换运动效果的方法

2019-11-20 12:43:29

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本文实例讲述了js实现交换运动效果的方法。分享给大家供大家参考。具体分析如下：

实现后的效果，点击互相交换位置和距离左边和上角的信息。

要点一：

var now = s_pic_li[0];for(var i=0; i<s_pic_li.length; i++){s_pic_li[i].onclick = function(){if(this == now) return false;var w = now.offsetWidth;var h = now.offsetHeight;var l = now.offsetLeft;var t = now.offsetTop;var w1= this.offsetWidth;var h1 = this.offsetHeight;var l1 = this.offsetLeft;var t1 = this.offsetTop;startrun(now,{width:w1,height:h1,left:l1,top:t1});startrun(this,{width:w,height:h,left:l,top:t});now=this;}}

循环给每一块加点击事件，获取交换双方的信息，然后执行运动函数，相关信息做为参数。

最后，上代码：

<!DOCTYPE html><html><head><meta charset="gb2312" /><title>无标题文档</title><style><!--body,ul,li{margin:0; padding:0;font:18px/1.5 arial; color:#333;}#big_pic{width:500px; height:400px;background:#ccc; text-align:center;position:absolute;}#s_pic li{float:left; width:100px;height:80px; display:inline;background:#06c; text-align:center;position:absolute; top:310px;}--></style><script><!--window.onload = function(){ var s_pic = document.getElementById("s_pic"); var s_pic_li = s_pic.getElementsByTagName("li"); var now = s_pic_li[0]; for(var i=0; i<s_pic_li.length; i++){  s_pic_li[i].onclick = function(){   if(this == now) return false;   var w = now.offsetWidth;   var h = now.offsetHeight;   var l = now.offsetLeft;   var t = now.offsetTop;   var w1= this.offsetWidth;   var h1 = this.offsetHeight;   var l1 = this.offsetLeft;   var t1 = this.offsetTop;   startrun(now,{width:w1,height:h1,left:l1,top:t1});   startrun(this,{width:w,height:h,left:l,top:t});   now=this;  } }}function getstyle(obj,name){ if(obj.currentStyle){  return obj.currentStyle[name]; }else{  return getComputedStyle(obj,false)[name]; }}function startrun(obj,json,fn){ clearInterval(obj.timer); obj.timer = setInterval(function(){  var isall = true;   for(var attr in json){   var cur=0;   if(attr == "opacity"){    cur = Math.round(parseFloat(getstyle(obj,attr))*100);   }else{    cur = parseInt(getstyle(obj,attr));   }   var speed = (json[attr] - cur)/8   speed = speed>0?Math.ceil(speed):Math.floor(speed);   if(cur != json[attr]){    isall = false;   }   if(attr == "opacity"){    obj.style.filter = "alpha(opacity="+(cur+speed)+")";    obj.style.opacity = (cur+speed)/100;   }else{    obj.style[attr] = cur+speed+"px";   }  }  if(isall){   clearInterval(obj.timer);   if(fn){    fn();   }  } },30);}//--></script></head><body><ul id="s_pic"> <li style="left:0; top:0; width:400px; height:300px">0</div> <li style="left:0;">1</li> <li style="left:110px;">2</li> <li style="left:220px;">3</li> <li style="left:330px;">4</li></ul></body></html>

希望本文所述对大家的javascript程序设计有所帮助。

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