Edit in JSFiddle

$(function(){
    var $body = $("body");
    
    for(i=0;i<1000;i++){
        $body.append("<input type='button' value='Button "+  (i+1)  +"' onclick='window.startTime=new Date()'/>​");
    } 
    $("input[type=button]").live("click",function(){
            alert((new Date() - window.startTime) + "秒後執行")            
    });
});