JS function code for Chinese string interception_javascript skills-JS Tutorial-php.cn

JS function code for Chinese string interception_javascript skills

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Release： 2016-05-16 17:36:27

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In order to solve this problem, yesterday I wrote a function that intercepts strings based on the number of bytes.
The specific use is very simple, just use it like String.subString(start, end). For example: var str = "Hey, I will caress you"; var str1 = str.subCHStr(2, 2); var str2 = str.subCHString(2, 4); alert(str1 " == " str2);

Copy code The code is as follows:

Code
//Calculate the string length
String.prototype.strLen = function() {
 var len = 0;
 for (var i = 0; i < this.length; i ) {
 if (this.charCodeAt(i) > 255 || this.charCodeAt(i) < 0) len = 2; else len ;
 }
 return len;
}
//Split the string into characters and store them in In the array 
String.prototype.strToChars = function(){
 var chars = new Array();
 for (var i = 0; i < this.length; i ){
 chars [i] = [this.substr(i, 1), this.isCHS(i)];
 }
 String.prototype.charsArray = chars;
 return chars;
}
 //Determine whether a character is a Chinese character 
String.prototype.isCHS = function(i){
 if (this.charCodeAt(i) > 255 || this.charCodeAt(i) < 0) 
                                        return true; end){
 var len = 0;
 var str = "";
 this.strToChars();
 for (var i = 0; i < this.length; i ) {
 if(this.charsArray[i][1])
 len = 2;
 else
 len ;
 if (end < len)
 return str;
 else if (start < len)
 str = this.charsArray[i][0];
 }
 return str;
}
//Intercept string (intercepted from start byte length bytes)
String.prototype.subCHStr = function(start, length){
 return this.subCHString(start, start length);
}