JS判斷字串長度(英文佔1個字元,中文漢字佔2個字元)
阿新 • • 發佈:2019-01-05
//計算字串長度(英文佔1個字元,中文漢字佔2個字元)
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);
- //單位元組加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>獲得字串實際長度,中文2,英文1</summary>
- ///<param name="str">要獲得長度的字串</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:
把雙位元組的替換成兩個單位元組的然後再獲得長度
[javascript] view plain copy
- 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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