js实现div色块碰撞
时间：2020-10-27 15:37:17|栏目：JavaScript代码|点击： 次
本文实例为大家分享了js实现div色块碰撞的具体代码，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。
效果：
实现：
js文件：
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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