基于JavaScript+HTML5 实现打地鼠小游戏逻辑流程图文(4)

var l1=document.getElementById('Img').offsetLeft; 
var r1=document.getElementById('Img')
.offsetLeft+document.getElementById('Img').offsetWidth; 
var t1=document.getElementById('Img').offsetTop; 
var b1=document.getElementById('Img')
.offsetTop+document.getElementById('Img').offsetHeight; 
var l2=document.getElementById('m'+num).offsetLeft; 
var r2=document.getElementById('m'+num)
.offsetLeft+document.getElementById('m'+num).offsetWidth; 
var t2=document.getElementById('m'+num).offsetTop; 
var b2=document.getElementById('m'+num)
.offsetTop+document.getElementById('m'+num).offsetHeight; 
//锤子与老鼠碰撞计算
if(r1<l2 || l1>r2 || b1<t2 || t1>b2) 
 { 
 var ele = document.getElementById("m"+num);
 //实现锤子点击动画
 ele.onmousedown = function(){
 ChangeBg("Img","img/hammer2.png");
 //打中老鼠老鼠切换图片
 document.form1.score.value = beat;
 console.log("总得分为："+beat);   document.getElementById('m'+num)
.style.backgroundImage='url(img/mouse2.png)'; 
 } 
beat+=1; 
 } 
else 
 { 
 var ele = document.getElementById("m"+num);
 //实现锤子点击动画
 ele.onmousedown = function(){
 ChangeBg("Img","img/hammer2.png"); document.getElementById('m'+num).style.background='url(img/mouse1.png); 
}
 }