JS判断字符串长度(英文占1个字符,中文汉字占2个字符)

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:

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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:

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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:

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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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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

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getBLen = function(str) {  
if (str == null) return 0;
if (typeof str != "string"){
str += "";
}
return str.replace(/[^\x00-\xff]/g,"01").length;
}