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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>--ƹÅÒÇò--</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<style>
.main{
width:690px;
margin:0 auto;
}
#box{
width:680px;
height:340px;
border:1px solid green;
position:relative;
}
.pingpang{
position:absolute;
width:10px;
height:10px;
background-color:red;
overflow:hidden;
}
.pingpangpai{
position:absolute;
width:60px;
height:10px;
background-color:black;
overflow:hidden;
}
#bigin{
margin:0 auto;
margin:10px;
padding:5px;
}
</style>
<script text="text/javascript" language="javascript">
var Px=0,Py=0;//ƹÅÒÊײ¿
var PPx,PPy;//ƹÅÒÅÄ
var Gox=10,Goy=10;
var end=false;//¹ý½ç
var isOver = false;//ÓÎÏ·½áÊø
var score = 0;//·ÖÊý
var isMove = 0;//ƹÅÒÅĿɷñÒÆ¶¯
function $(id){
return document.getElementById(id);
}
window.onload = function(){
Px = Math.round(Math.random()*33)*20;
createPingPang(Px,Py);
createPingPangPai(300,330);
AllDiv = $("box").all.tags("DIV");
AllSpan = $("box").all.tags("SPAN");
$("bigin").attachEvent('onclick',function(){
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Repaints and Reflows ÖØ»æºÍÖØÅŰæ
Once the browser has downloaded all the components of a page—HTML markup, JavaScript, CSS, images—it parses through the files and creates two internal data structures:
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Data Formats Êý¾Ý¸ñʽ
When considering data transmission techniques, you must take into account several factors: feature set, compatibility, performance, and direction (to or from the server). When considering data formats, the only scale you need for comparison is speed.
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JavaScript Minification JavaScript½ô´Õ
JavaScript minification is the process by which a JavaScript file is stripped of everything that does not contribute to its execution. This includes comments and unnecessary whitespace. The process typically reduces the file size by ha ......
Summary ×ܽá
When web pages or applications begin to feel slow, analyzing assets as they come over the wire and profiling scripts while they are running allows you to focus your optimization efforts where they are needed most.
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