JS常用方法
以下为web开发中常用到的js方法;收集并整理出来;简单的就不写出来了
// 返回字符的长度,一个中文算2个
String.prototype.ChineseLength=function()
{
return this.replace(/[^\x00-\xff]/g,"**").length;
}
// 判断字符串是否以指定的字符串结束
String.prototype.EndsWith = function(str)
{
return this.substr(this.length - str.length) == str;
}
// 去掉字符左端的的空白字符
String.prototype.LeftTrim = function()
{
return this.replace(/(^[\\s]*)/g, "");
}
// 去掉字符右端的空白字符
String.prototype.RightTrim = function()
{
return this.replace(/([\\s]*$)/g, "");
}
// 判断字符串是否以指定的字符串开始
String.prototype.StartsWith = function(str)
{
return this.substr(0, str.length) == str;
}
// 去掉字符两端的空白字符
String.prototype.Trim = function()
{
return this.replace(/(^\s*)|(\s*$)/g, "");
}
1
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2
<HTML>
3
<HEAD>
4
<TITLE> New Document </TITLE>
5
<META NAME="Generator" CONTENT="EditPlus">
6
<META NAME="Author" CONTENT="">
7
<META NAME="Keywords" CONTENT="">
8
<META NAME="Description" CONTENT="">
9
<script language=javascript>
10
String.prototype.Replace = function(oldValue,newValue)
11
{
12
var reg = new RegExp(oldValue,"g");
13
return this.replace(reg, newValue);
14
}
15
//字符串替换;曾经很头疼写了很多代码,还是这个简单
16
function replace(obj)
17
{
18
alert(obj.value.Replace("a","d"));
19
}
20![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
// 另存为文件
22
function SaveCode(obj, filename)
23
{
24
var win = window.open('', '_blank', 'top=100');
25
var code = obj.innerText;
26
code = code == null || code == "" ? obj.value : code;
27
win.opener = null;
28
win.document.write(code);
29
win.document.execCommand('saveas', true, filename);
30
win.close();
31
}
32
// 问候
33
window.onload = function()
34
{
35
var now = new Date();
36
var hour = now.getHours();
37
var greeting;
38
if (hour < 6)
39
greeting = "凌晨好";
40
else if (hour < 10)
41
greeting = "早上好";
42
else if (hour < 14)
43
greeting = "中午好";
44
else if (hour < 18)
45
greeting = "下午好";
46
else
47
greeting = "晚上好";
48
49
document.getElementById("hi").innerHTML = "<font color=red>" + greeting + "</font>" ;
50
}
51
// 将光标停在对象的最后
52
function PutCursorAtLast(obj)
53
{
54
obj.focus();
55
var range = obj.createTextRange();
56
range.moveStart('character',obj.value.length);
57
range.collapse(true);
58
range.select();
59
}
60
// 将光标停在对象的最前
61
function PutCursorAtFirst(obj)
62
{
63
obj.focus();
64
var range = obj.createTextRange();
65
range.moveStart('character',0);
66
range.collapse(true);
67
range.select();
68
}
69
</script>
70
</HEAD>
71![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
72
<BODY>
73
<span id="hi"></span>
74
<br/>
75
<span> curssor at last </span>
76
<br/>
77
<input type=text value="curssor at last" onclick=PutCursorAtLast(this)>
78
<br/>
79
<span> curssor at first </span>
80
<br/>
81
<input type=text value="curssor at first" onclick=PutCursorAtFirst(this)>
82
<br/>
83
<span> String.Replace </span>
84
<br/>
85
<INPUT TYPE=TEXT value="replace" ONCLICK=replace(this)>
86
<br/>
87
<span> save file </span>
88
<br/>
89
<input type=text value="hello word" onclick=SaveCode(this,"save")>
90
</BODY>
91
</HTML>
92![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
6
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
7
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
8
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
9
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
10
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
12
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
13
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
14
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
15
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
17
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
18
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
19
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
20
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
22
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
23
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
24
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
25
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
26
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
27
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
28
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
29
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
30
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
31
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
32
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
33
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
34
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
35
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
36
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
37
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
38
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
39
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
40
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
41
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
42
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
43
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
44
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
45
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
46
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
47
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
48
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
49
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
50
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
51
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
52
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
53
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
54
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
55
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
56
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
57
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
58
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
59
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
60
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
61
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
62
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
63
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
64
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
65
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
66
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
67
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
68
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
69
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
70
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
71
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
72
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
73
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
74
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
75
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
76
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
77
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
78
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
79
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
80
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
81
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
82
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
83
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
84
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
85
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
86
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
87
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
88
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
89
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
90
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
91
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
92
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
1
//给定一个时间返回该时间是当前月的第几周
2
function getWeek(a, b, c) {
3
var date = new Date(a, b - 1, c);
4
return Math.ceil((c + 7 - (date.getDay() || 7)) / 7);
5
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
TrackBack:http://www.cnblogs.com/doll-net/archive/2007/03/13/673183.html