web前端|js教程
js,同一页面,不同,运动效果
web前端-js教程
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要点一：
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function getstyle(obj,name){if(obj.currentStyle){return obj.currentStyle[name];}else{return getComputedStyle(obj,false)[name];}}
从样式表中根据id和属性名取值。
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要点二：
if(attr == "opacity"){cur = Math.round(parseFloat(getstyle(obj,attr))*100);}else{cur = parseInt(getstyle(obj,attr));}
如果设置的是透明度的值，因为有可能会是小数点，所以需要用parseFloat，然后有可能会有小数，用round方法四舍五入取整。
如果设置的非透明度值，用parseInt，可以只取数值部分
其它的注意点，前面几篇都有提到，此处不再赘述。
最后，上代码：
无标题文档body,ul,li{margin:0; padding:0;}#runs li{width:80px; height:80px; background:#06c;list-style:none; margin:10px; border:1px solid #000;filter:alpha(opacity=30); opacity:0.3;}window.onload = function(){ var runs = document.getElementById("runs"); var runs_li = runs.getElementsByTagName("li"); runs_li[0].onmouseover = function(){ startrun(this,"width",300); } runs_li[0].onmouseout = function(){ startrun(this,"width",80); } runs_li[1].onmouseover = function(){ startrun(this,"height",300); } runs_li[1].onmouseout = function(){ startrun(this,"height",80); } runs_li[2].onmouseover = function(){ startrun(this,"fontSize",50); } runs_li[2].onmouseout = function(){ startrun(this,"fontSize",14); } runs_li[3].onmouseover = function(){ startrun(this,"opacity",100); } runs_li[3].onmouseout = function(){ startrun(this,"opacity",30); }}function startrun(obj,attr,target){ 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); }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);}function getstyle(obj,name){ if(obj.currentStyle){ return obj.currentStyle[name]; }else{ return getComputedStyle(obj,false)[name]; }} 1 2 3 4
