本文实例讲述了js实现同一页面多个不同运动效果的方法。分享给大家供大家参考。具体分析如下:
要点一:
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。
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:
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>无标题文档</title> <style> 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;} </style> <script> 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"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]; } } </script> </head> <body> <ul id="runs"> <li style="top:0">1</li> <li style="top:90px;">2</li> <li style="top:180px;">3</li> <li style="top:270px;">4</li> </ul> </body> </html>
希望本文所述对大家的javascript程序设计有所帮助。
标签:
js,同一页面,不同,运动效果
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