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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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Conditionals Ìõ¼þ±í´ïʽ
Similar in nature to loops, conditionals determine how execution flows through JavaScript. The traditional argument of whether to use if-else statements or a switch statement applies to JavaScript just as it does to other languages. Since different b ......
String Trimming ×Ö·û´®ÐÞ¼ô
Removing leading and trailing whitespace from a string is a simple but common task. Although ECMAScript 5 adds a native string trim method (and you should therefore start to see this method in upcoming browsers), JavaScript has not historically in ......
Splitting Up Tasks ·Ö½âÈÎÎñ
What we typically think of as one task can often be broken down into a series of subtasks. If a single function is taking too long to execute, check to see whether it can be broken down into a series of smaller functions that complete in smaller ......
Working Around Caching Issues ¹ØÓÚ»º´æÎÊÌâ
Adequate cache control can really enhance the user experience, but it has a downside: when revving up your application, you want to make sure your users get the latest version of the static content. This is accomplished by renaming ......
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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