解决多个window.onload冲突：利用eval动态注册事件

if(window.onload!=null){ 
eval("theOldFun="+window.onload.toString()); 
window.onload=function(){theOldFun();addReadResource();}; 
}

function name1(){……} 
function name2(){……} 
var m="name1"; 
eval(m+'()');//运行name1(); 
m='name2'; 
eval(m+'()');//运行name2();