js自定义函数 延迟脚本执行(转载)

function delay(numberMillis){
        var now = new Date();
        var exitTime = now.getTime()+numberMillis;   
        while(true){
                now = new Date();
                if(now.getTime() > exitTime)
                        return;
        }
} 
document.write("<script language='javascript' src='js1.js'></script>");