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js实现类似jquery里animate动画效果的方法

2019-11-20 12:43:46
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本文实例讲述了js实现类似jquery里animate动画效果的方法。分享给大家供大家参考。具体分析如下:

该实例可实现鼠标移上,先宽度变化,再高度变化,最后透明度变化,鼠标移出,再依次变回去的效果。

要点一:

startrun(obj,attr,target,fn)box.onmouseover = function(){startrun(box,"width",200,function(){startrun(box,"height",200,function(){startrun(box,"opacity","100")});});}

如上面,函数也可以做为参数使用,就可以达到先执行某个动作,再执行某个动作的效果了。

要点二:

if(cur == target){clearInterval(obj.timer);if(fn){fn();}}

当运动到达目标点,关闭定时器,然后就可以执行新的函数了。

最后,上代码:

<!DOCTYPE html><html><head><meta charset="gb2312" /><title>无标题文档</title><style><!--body{margin:0; padding:0; font:12px/1.5 arial;}#box{width:100px; height:100px; position:absolute;background:#06c; left:0;filter:alpha(opacity=30); opacity:0.3;}--></style><script><!--function getstyle(obj,name){ if(obj.currentStyle){  return obj.currentStyle[name]; }else{  return getComputedStyle(obj,false)[name]; }}window.onload = function(){ var box = document.getElementById("box"); box.onmouseover = function(){  startrun(box,"width",200,function(){   startrun(box,"height",200,function(){    startrun(box,"opacity","100")   });  }); } box.onmouseout = function(){  startrun(box,"height",100,function(){   startrun(box,"width",100,function(){    startrun(box,"opacity","30");   });  }); }}function startrun(obj,attr,target,fn){ clearInterval(obj.timer); obj.timer = setInterval(function(){  var cur = 0;  if(attr == "opacity"){   cur = Math.round(parseFloat(getstyle(obj,attr))*100);  }else{   cur = parseInt(getstyle(obj,attr));  }  var speed = (target-cur)/8;  speed = speed>0?Math.ceil(speed):Math.floor(speed);    if(cur == target){   clearInterval(obj.timer);   if(fn){    fn();   }  }else{   if(attr == "opacity"){    obj.style.filter = "alpha(opacity="+(cur+speed)+")";    obj.style.opacity = (cur+speed)/100;   }else{   obj.style[attr] = cur + speed + "px";   }  } },30)}//--></script></head><body><div id="box"></div></body></html>

希望本文所述对大家的javascript程序设计有所帮助。

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