1、sports.js代码
function sport(obj,json,fn){ //1.先停止上一次的计时器 clearInterval(obj.timer); //2.开启新的计时器 obj.timer = setInterval(()=>{ //1.设置开关 let stop = true; //2.遍历json for(let attr in json){ //1.获取当前值 let cur = attr === 'opacity' ? parseInt(parseFloat(getStyle(obj,attr) )* 100) : parseInt(getStyle(obj,attr)); //2.计算速度 let speed = (json[attr] - cur) / 8; speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); //3.判断是否结束 if(cur !== json[attr]){ stop = false; } //4.设置运动 if(attr === 'opacity'){ obj.style.opacity = (cur + speed) / 100; obj.style.filter = "alpha(opacity=" + (cur + speed) + ")"; }else{ obj.style[attr] = cur + speed + 'px'; } } if(stop){ clearInterval(obj.timer); if(typeof fn === 'function'){ fn(); } } },30) }
//获取非行内样式(兼容)
function getStyle(obj,attr){
return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj,1)[attr];
}
2.1、多物体运动(非链式)
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
<style type="text/css">
body{
height: 5000px;
}
div{
100px;
height: 100px;
background: red;
border: 2px solid black;
opacity: 1;
filter: alpha(opacity=100);
}
</style>
</head>
<body>
<div></div>
<script src="sport.js"></script>
<script type="text/javascript">
const oDiv = document.querySelectorAll('div')[0];
oDiv.onmouseenter = function(){
sport(this,{width : 400,height:400,opacity:30});
}
oDiv.onmouseleave = function(){
sport(this,{width : 100,height : 100,opacity : 100});
}
</script>
</body>
</html>
2.2、多物体运动(链式)
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
<style type="text/css">
#box{
100px;
height: 100px;
background: red;
opacity: 1;
filter: alpha(opacity=100);
}
</style>
</head>
<body>
<div id="box">
</div>
<script src="sport.js"></script>
<script type="text/javascript">
let oDiv = document.getElementById("box");
//箭头函数
oDiv.onmouseenter = function(){
sport(this,{width : 300},()=>{
sport(this,{height : 300},()=>{
sport(this,{opacity : 30})
})
});
}
//bind
oDiv.onmouseleave = function(){
sport(this,{opacity : 100},function(){
sport(this,{height : 100},function(){
sport(this,{width : 100},"hehe")
}.bind(this))
}.bind(this))
}
</script>
</body>
</html>