JS判断字符串长度(英文占1个字符,中文汉字占2个字符)
2017-03-24 11:31
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转载来源:http://blog.csdn.net/testcs_dn/article/details/21412303#
//计算字符串长度(英文占1个字符,中文汉字占2个字符)
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![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
String.prototype.gblen = function() {
var len = 0;
for (var i=0; i<this.length; i++) {
if (this.charCodeAt(i)>127 || this.charCodeAt(i)==94) {
len += 2;
} else {
len ++;
}
}
return len;
}
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
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![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
function strlen(str){
var len = 0;
for (var i=0; i<str.length; i++) {
var c = str.charCodeAt(i);
//单字节加1
if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {
len++;
}
else {
len+=2;
}
}
return len;
}
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
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![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
var jmz = {};
jmz.GetLength = function(str) {
///<summary>获得字符串实际长度,中文2,英文1</summary>
///<param name="str">要获得长度的字符串</param>
var realLength = 0, len = str.length, charCode = -1;
for (var i = 0; i < len; i++) {
charCode = str.charCodeAt(i);
if (charCode >= 0 && charCode <= 128) realLength += 1;
else realLength += 2;
}
return realLength;
};
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
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copy
print?
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
var l = str.length;
var blen = 0;
for(i=0; i<l; i++) {
if ((str.charCodeAt(i) & 0xff00) != 0) {
blen ++;
}
blen ++;
}
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
[javascript]
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print?
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/9e12f1d3e499fc949c886e7c9e0484f9)
getBLen = function(str) {
if (str == null) return 0;
if (typeof str != "string"){
str += "";
}
return str.replace(/[^\x00-\xff]/g,"01").length;
}
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
//计算字符串长度(英文占1个字符,中文汉字占2个字符)
方法一:
[javascript]view plain
copy
print?
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
String.prototype.gblen = function() {
var len = 0;
for (var i=0; i<this.length; i++) {
if (this.charCodeAt(i)>127 || this.charCodeAt(i)==94) {
len += 2;
} else {
len ++;
}
}
return len;
}
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
String.prototype.gblen = function() { var len = 0; for (var i=0; i<this.length; i++) { if (this.charCodeAt(i)>127 || this.charCodeAt(i)==94) { len += 2; } else { len ++; } } return len; }
方法二:
[javascript]view plain
copy
print?
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
function strlen(str){
var len = 0;
for (var i=0; i<str.length; i++) {
var c = str.charCodeAt(i);
//单字节加1
if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) {
len++;
}
else {
len+=2;
}
}
return len;
}
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
function strlen(str){ var len = 0; for (var i=0; i<str.length; i++) { var c = str.charCodeAt(i); //单字节加1 if ((c >= 0x0001 && c <= 0x007e) || (0xff60<=c && c<=0xff9f)) { len++; } else { len+=2; } } return len; }
方法三:
[javascript]view plain
copy
print?
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
var jmz = {};
jmz.GetLength = function(str) {
///<summary>获得字符串实际长度,中文2,英文1</summary>
///<param name="str">要获得长度的字符串</param>
var realLength = 0, len = str.length, charCode = -1;
for (var i = 0; i < len; i++) {
charCode = str.charCodeAt(i);
if (charCode >= 0 && charCode <= 128) realLength += 1;
else realLength += 2;
}
return realLength;
};
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
var jmz = {}; jmz.GetLength = function(str) { ///<summary>获得字符串实际长度,中文2,英文1</summary> ///<param name="str">要获得长度的字符串</param> var realLength = 0, len = str.length, charCode = -1; for (var i = 0; i < len; i++) { charCode = str.charCodeAt(i); if (charCode >= 0 && charCode <= 128) realLength += 1; else realLength += 2; } return realLength; };
方法四:
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copy
print?
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
var l = str.length;
var blen = 0;
for(i=0; i<l; i++) {
if ((str.charCodeAt(i) & 0xff00) != 0) {
blen ++;
}
blen ++;
}
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
var l = str.length; var blen = 0; for(i=0; i<l; i++) { if ((str.charCodeAt(i) & 0xff00) != 0) { blen ++; } blen ++; }
方法五:
把双字节的替换成两个单字节的然后再获得长度[javascript]
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print?
![](https://oscdn.geek-share.com/Uploads/Images/Content/201611/a7c8e286f463007e2a900848b93dd72c.png)
getBLen = function(str) {
if (str == null) return 0;
if (typeof str != "string"){
str += "";
}
return str.replace(/[^\x00-\xff]/g,"01").length;
}
![](https://oscdn.geek-share.com/Uploads/Images/Content/201701/9cc493f1e15b23d0f4eaea0d0f8b35d0.png)
getBLen = function(str) { if (str == null) return 0; if (typeof str != "string"){ str += ""; } return str.replace(/[^\x00-\xff]/g,"01").length; }
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