<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>点击下落</title>
<style type="text/css">
body{
height: 600px;
}
li{
margin: 20px;
position: absolute;
top: 20px;
width: 50px;
height: 50px;
list-style: none;
background: red;
}
</style>
<script type="text/javascript">
window.onload = function(){
/*获取元素属性值*/
function getStyle(ele,attr){
return ele.currentStyle? ele.currentStyle[attr] :getComputedStyle(ele)[attr];
}
/*改变属性元素移动*/
function doMove(ele,dir,attr,target,endFn){
dir = parseInt(getStyle(ele,attr))<target ? dir : -dir;
clearInterval(ele.timer);
ele.timer = setInterval(function(){
var speed = parseInt(getStyle(ele,attr))+dir;
if (speed>=target&&dir>0||speed<=target&&dir<0) { //向前跑
speed = target;
};
ele.style[attr] = speed+'px';
if (speed==target) {
clearInterval(ele.timer);
endFn&&endFn();
}
},30)
}
for (var i = 0; i < 20; i++) {
document.body.innerHTML += "<li style='left:"+i*60+"px'></li>"
};
var lists = document.getElementsByTagName('li');
var onoff=false;
var updown =true;
var n;
document.body.onclick = UDFloat;
function UDFloat(){
if (onoff) {
return
};
onoff = true;
if (updown) {
n = 0;
updown = false;
} else{
n = 2;
updown = true;
}
var arr = [50,400,50,50];
var num = 0;
timerT= null;
clearInterval(this.animate);
timerT = setInterval(function(){
doMove(lists[num],arr[n],'top',arr[n+1]);
num++;
if(num==lists.length){
clearInterval(timerT);
}
},80)
onoff = false;
}
}
</script>
</head>
<body>
</body>
</html>
var movedCount=0,listLength=lists.length;
function UDFloat(){
//判断完成的数量，如果已经完成，重置于movedCount为0
if(movedCount!==0&&movedCount!==listLength){
return;
}
if(movedCount===listLength){
movedCount=0;
}
if (updown) {
n = 0;
updown = false;
} else{
n = 2;
updown = true;
}
var arr = [50,400,50,50];
var num = 0;
timerT= null;
clearInterval(this.animate);
timerT = setInterval(function(){
doMove(lists[num],arr[n],'top',arr[n+1],function(){
//move完成后，记录完成的数量
movedCount++;
});
num++;
if(num==lists.length){
clearInterval(timerT);
}
},80)
}