1
<html><head><title>用command模式模拟多线程</title></head><body>
2
<SCRIPT LANGUAGE="JavaScript">
3
<!--
4if (Array.prototype.shift==null)
5
Array.prototype.shift = function (){
6 var rs = this[0];
7 for (var i=1;i<this.length;i++) this[i-1]=this[i]
8 this.length=this.length-1
9 return rs;
10
}
11if (Array.prototype.push==null)
12Array.prototype.push = function (){
13 for (var i=0;i<arguments.length;i++) this[this.length]=arguments[i];
14 return this.length;
15}
16
17var commandList = [];
18var nAction = 0;//控制每次运行多少个动作
19var functionConstructor = function(){}.constructor;
20function executeCommands(){
21 for (var i=0;i<nAction;i++)
22 if (commandList.length>0){
23 var command = commandList.shift();
24 if (command.constructor == functionConstructor)
25 if (command.scheduleTime == null || new Date()-command.scheduleTime>0)
26 command();
27 else
28 commandList.push(command);
29 }
30}
31
32function startNewTask(){
33 var resultTemp = document.getElementById("sampleResult").cloneNode(true);
34 with (resultTemp){
35 id="";style.display="block";style.color=(Math.floor(Math.random()* (1<<23)).toString(16)+"00000").substring(0,6);
36 }
37 document.body.insertBefore(resultTemp,document.body.lastChild);
38 commandList.push(function(){simThread(resultTemp,1);});
39 nAction++;
40}
41
42function simThread(temp,n){
43 if (temp.stop) n--;
44 else temp.innerHTML = temp.innerHTML - (-n);
45 if (n<1000)
46 commandList.push(function(){simThread(temp,++n)});
47 else{
48 var command = function(){document.body.removeChild(temp);;nAction--;};
49 command.scheduleTime = new Date()-(-2000);
50 commandList.push(command);
51 }
52}
53
54window.onload = function(){setInterval("executeCommands()",1);}
55
//-->
56</SCRIPT>
57<button onclick="startNewTask()">开始新线程</button>
58
59<BR><BR>
60<div id=sampleResult onmouseover="this.stop=true" onmouseout="this.stop=false" style="display:none;cursor:hand">0</div>
61</body>
62</html>
<html><head><title>用command模式模拟多线程</title></head><body>2
<SCRIPT LANGUAGE="JavaScript">
3
<!--4
if (Array.prototype.shift==null)5
Array.prototype.shift = function (){
Array.prototype.shift 6
var rs = this[0];7
for (var i=1;i<this.length;i++) this[i-1]=this[i]8
this.length=this.length-19
return rs;10
}11
if (Array.prototype.push==null)12
Array.prototype.push = function (){13
for (var i=0;i<arguments.length;i++) this[this.length]=arguments[i];14
return this.length;15
}16
17
var commandList = [];18
var nAction = 0;//控制每次运行多少个动作19
var functionConstructor = function(){}.constructor;20
function executeCommands(){21
for (var i=0;i<nAction;i++)22
if (commandList.length>0){23
var command = commandList.shift();24
if (command.constructor == functionConstructor)25
if (command.scheduleTime == null || new Date()-command.scheduleTime>0)26
command();27
else28
commandList.push(command);29
}30
}31
32
function startNewTask(){33
var resultTemp = document.getElementById("sampleResult").cloneNode(true);34
with (resultTemp){35
id="";style.display="block";style.color=(Math.floor(Math.random()* (1<<23)).toString(16)+"00000").substring(0,6);36
}37
document.body.insertBefore(resultTemp,document.body.lastChild);38
commandList.push(function(){simThread(resultTemp,1);});39
nAction++;40
}41
42
function simThread(temp,n){43
if (temp.stop) n--;44
else temp.innerHTML = temp.innerHTML - (-n);45
if (n<1000)46
commandList.push(function(){simThread(temp,++n)});47
else{48
var command = function(){document.body.removeChild(temp);;nAction--;};49
command.scheduleTime = new Date()-(-2000);50
commandList.push(command);51
}52
}53
54
window.onload = function(){setInterval("executeCommands()",1);}55
//-->56
</SCRIPT>57
<button onclick="startNewTask()">开始新线程</button>58
59
<BR><BR>60
<div id=sampleResult onmouseover="this.stop=true" onmouseout="this.stop=false" style="display:none;cursor:hand">0</div>61
</body>62
</html> 注意第26行。javascript里面函数也是对象，所以就没有必要把函数调用包装到do或者execute方法里面了，直接用()就可以让函数对象运行起来：
command();
shift和push函数是javascript中array对象的函数，可是IE5居然没有定义，最前面两个函数是为IE5准备的。
在IE和FireFox下面通过