拖拽碰撞--原声js(自身理解上新的方法)

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <title>无标题文档</title>

 <style>

 div{width:100px;

     height:100px;

 }

 #box{background:red; position:absolute; }

 #box1{background:green;position:absolute;top:300px; left:300px;}

 </style>

 <script>

 //两个碰撞的盒子。是建立在一个不动的基础上。所以可以根据不动的盒子求出四个方向的left和top值。然后再判断其是否碰撞，且碰撞的过程随时改变其层级，（原需 var 8个变量，现在只需4个变量）

 function collText(obj,left,top,obj1){

             var l1=obj.offsetLeft-obj.offsetWidth;

             var t1=obj.offsetTop-obj.offsetHeight;

             var r1=obj.offsetLeft+obj.offsetWidth;

             var b1=obj.offsetTop+obj.offsetHeight;

             if(left<l1||top<t1||left>r1||top>b1){

                 obj.style.zIndex=;

                 obj1.style.zIndex=;

                 return true;

             }else{

                 obj.style.zIndex=;

                 obj1.style.zIndex=;

                 return false;

             }

 };

 window.onload=function(){

     var oBox=document.getElementById('box');

     var oBox1=document.getElementById('box1');

     oBox.onmousedown=function(ev){

         var oEvent= ev   ||    event;

         var disX=oEvent.clientX-oBox.offsetLeft;

         var disY=oEvent.clientY-oBox.offsetTop;

         document.onmousemove=function(ev){

             var oEvent= ev  ||    event;

             var l=oEvent.clientX-disX;

             var t=oEvent.clientY-disY;

             oBox.style.left=l+'px'    ;

             oBox.style.top=t+'px'    ;

             if(collText(oBox1,l,t,oBox)){

                 oBox1.style.background='green';

             }else{

                 oBox1.style.background='yellow';

             }

         };

         document.onmouseup=function(){

             document.onmousemove=null;

             document.onmouseup=null;

             oBox.reseaseCapture&&oBox.reseaseCapture();

         };

         oBox.setCapture&&oBox.setCapture();

         return false;

     }

     oBox1.onmousedown=function(ev){

         var oEvent= ev ||    event;

         var disX1=oEvent.clientX-oBox1.offsetLeft;

         var disY1=oEvent.clientY-oBox1.offsetTop;

         document.onmousemove=function(ev){

             var oEvent= ev ||    event;

             var le=oEvent.clientX-disX1;

             var to=oEvent.clientY-disY1;

             oBox1.style.left=le+'px'    ;

             oBox1.style.top=to+'px'    ;

             if(collText(oBox,le,to,oBox1)){

                 oBox.style.background='red';

             }else{

                 oBox.style.background='#000';

             }

         };

         document.onmouseup=function(){

             document.onmousemove=null;

             document.onmouseup=null;

             oBox1.reseaseCapture&&oBox1.reseaseCapture();

         }

         oBox1.setCapture&&oBox1.setCapture();

         return false;

     }

 }

 </script>

 </head>

 <body>

 <div id="box"></div>

 <div id="box1"></div>

 </body>

 </html>
巴特西

拖拽碰撞--原声js(自身理解上新的方法)

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