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
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
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
<!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
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
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
// 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//给定一个时间返回该时间是当前月的第几周
2function getWeek(a, b, c) {
3 var date = new Date(a, b - 1, c);
4 return Math.ceil((c + 7 - (date.getDay() || 7)) / 7);
5}
//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
}
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