js实现div色块碰撞

本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下

描述：

生成两个div色块，一个可以拖动，一个不可以，用拖动的去撞击不能动的，会将这个色块随机撞到一个位置，改变颜色。

js实现div色块碰撞

实现：

function DragObj(_obj) {
  this.obj=_obj;
  this.point={};
  this.moveBool=false;
  this.obj.self=this;
  this.obj.addEventListener("mousedown",this.mouseHandler);
  this.obj.addEventListener("mouseup",this.mouseHandler);
  this.obj.addEventListener("mousemove",this.mouseHandler);
  this.obj.addEventListener("mouseleave",this.mouseHandler);
}
DragObj.prototype={
  mouseHandler:function (e) {
    if(!e){
      e=window.event;
    }
    if(e.type=="mousedown"){
      this.self.moveBool=true;
      this.self.point.x=e.offsetX;
      this.self.point.y=e.offsetY;
    }else if(e.type=="mousemove"){
      if(!this.self.moveBool) return;
      this.self.obj.style.left=(e.clientX-this.self.point.x)+"px"
      this.self.obj.style.top=(e.clientY-this.self.point.y)+"px"
    }else if(e.type=="mouseup" || e.type=="mouseleave"){
      this.self.moveBool=false;
    }
  },removeEvent:function () {
 
    this.obj.removeEventListener("mousedown",this.mouseHandler);
    this.obj.removeEventListener("mouseup",this.mouseHandler);
    this.obj.removeEventListener("mousemove",this.mouseHandler);
    this.obj.removeEventListener("mouseleave",this.mouseHandler);
 
    this.obj=null;
    this.point=null;
  }
};
var HitTest=HitTest || (function () {
  return {
    to:function (display0,display1) {
      var rect=display0.getBoundingClientRect();
      var rect1=display1.getBoundingClientRect();
      if(rect.left>=rect1.left &&
rect.left<=rect1.left+rect1.width
 && rect.top>=rect1.top && rect.top<=rect1.top+rect1.height){
        return true;
      }
      if(rect.left+rect.width>=rect1.left && rect.left+rect.width<=rect1.left+rect1.width && rect.top>=rect1.top
 && rect.top<=rect1.top+rect1.height){
        return true;
      }
      if(rect.left>=rect1.left &&
rect.left<=rect1.left+rect1.width
&& rect.top+rect.height>=rect1.top &&
rect.top+rect.height<=rect1.top+rect1.height){
        return true;
      }
      if(rect.left+rect.width>=rect1.left && rect.left+rect.width<=rect1.left+rect1.width &&
rect.top+rect.height>=rect1.top
&& rect.top+rect.height<=rect1.top+rect1.height){
        return true;
      }
    }
  }
})();
var LoadImg=LoadImg || (function () {
  return {
    load:function (listSrc,callBack) {
      this.callBack=callBack;
      this.listSrc=listSrc;
      this.num=0;
      this.imgArr=[];
      var img=new Image();
      img.addEventListener("load",this.loadHandler.bind(this));
      img.src=listSrc[0];
    },loadHandler:function (e) {
      if(!e){
        e=window.event;
      }
      e.currentTarget.removeEventListener
("load",this.loadHandler.bind(this));
      this.imgArr[this.num]=e.currentTarget;
      if(this.num==this.listSrc.length-1){
        this.callBack(this.imgArr)
        return;
      }
      var img=new Image();
      this.num++;
      img.addEventListener("load",this.loadHandler.bind(this));
      img.src=this.listSrc[this.num];
    }
  }
})();

html：

<!DOCTYPE html>
<html lang="en">
<head>
  <Meta charset="UTF-8">
  <title>Title</title>
  <style>
    div{
      width: 200px;
      height: 200px;
      position: absolute;
    }
  </style>
  <script src="js/dragObj.js"></script>
</head>
<body>
<div id="div0"></div>
<div id="div1"></div>
<script>
  window.addEventListener("mousedown",mousedownHandler);//生成一个
  function mousedownHandler(e) {
    if(!e){
      e=window.event;
    }
    e.preventDefault();
  }
  var div0=document.getElementById("div0");
  var div1=document.getElementById("div1");
  div0.style.backgroundColor=randomColor();
  div1.style.backgroundColor=randomColor();
 
  randomPosition(div0)
  randomPosition(div1)
  var drag0=new DragObj(div0);
  div0.addEventListener("mousemove",mouseMoveHandler)
  function randomColor() {
    var str="#";
    for(var i=0;i<3;i++){
      var color=Math.floor(Math.random()*256).toString(16);
      if(color.length<2){
        color="0"+color;
      }
      str+=color;
    }
    return str;
  }
 
  function randomPosition(div) {
    div.style.left=Math.random()*(document.documentElement.clientWidth-50)+"px";
    div.style.top=Math.random()*(document.documentElement.clientHeight-50)+"px";
 
  }
 
  function mouseMoveHandler(e) {
    if(!e){
      e=window.event;
    }
    if(!drag0.moveBool) return;
 
    if(HitTest.to(div0,div1)){
      randomPosition(div1);
      div1.style.backgroundColor=randomColor();
 
    }
  }
</script>
 
</body>
</html>

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js实现div色块碰撞

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