String length calculation, interception, URL parameter acquisition

1. Chinese-English mixed character interception

//Chinese length interception calculation, it is advisable to mix in English, the number up rounding, accuracy of 1 English characters error, an English is a character, a Chinese character counted as a char.     //Sub ("Chinese Zlsd", 1), "Medium"    //Sub ("Chinese Zlsd", 3), "Chinese"     functionSubch (str,n) {varr=/[^\x00-\xff]/G; if(Str.replace (R, "MM"). Length<=n) {returnstr;} varM=math.floor (N/2); for(vari=m;i<str.length;i++){             if(Str.substr (0,i). Replace (R, "MM"). length>=N) {                 returnSTR.SUBSTR (0, i); }         }         returnstr; } 

2. Remove spaces before and after characters

Remove space before and after string
function () {        returnthis. replace (/^\s*/, ""). Replace (/\s*$/, "");    

3. Get string lengths in English and Chinese

// get a Chinese-English string length, one for one, one for English    function getstrlength (str) {        var cArr = Str.match (/[^\x00-\xff]/ig);         return null ? 0 : carr.length);    }

4. Get url parameter length

// url parameter get    function (parm) {          varnew RegExp ("(^|&)" + parm + "= ([^&]*] (&|$)");           var this. substr (this. indexOf ("\?") +1). Match (reg);           if (r!=nullreturnreturnnull;      

String length calculation, interception, URL parameter acquisition