js实现方块碰撞

两个div方块,碰撞到一起后其中一个方块变色

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{margin: 0;}
        #div1{width: 300px;
        height: 300px;
        background: red;
        position: absolute;
        left: 0;
        top: 0;
        }
        #div2{width: 200px;
        height: 200px;
        background: rgb(25, 245, 110);
        position: absolute;
        left: 600px;
        top: 360px;
        }
    </style>
</head>
<body>
    <div id="div1"></div>
    <div id="div2"></div>
</body>
</html>
<script>
    var div1=document.getElementById('div1')
    var div2=document.getElementById('div2')
    div1.onmousedown=function(event){
    var chaX=event.clientX-div1.offsetLeft
    var chaY=event.clientY-div1.offsetTop
    console.log(chaX+"sasa")
    document.onmousemove=function(event){
        div1.style.left=event.clientX-chaX+'px'
        div1.style.top=event.clientY-chaY+'px'
          if(div1.offsetLeft+div1.offsetWidth>=div2.offsetLeft&&div1.offsetTop+div1.offsetWidth>=div2.offsetTop
        &&div1.offsetLeft<=div2.offsetLeft+div2.offsetWidth&&div1.offsetTop<=div2.offsetTop+div2.offsetWidth
          ){
        div2.style.background='#000000'
    }else{div2.style.background=' rgb(25, 245, 110)'}
    } 
    document.onmouseup=function(){
        document.onmousemove=null
    } 

    }
    // div1.style.left>div2.style.left-300+'px'&&div1.style.top>div2.style.top

</script>

 

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