Determine the length of the string

Just saw the js method written before: calculate the string length (2 characters in Chinese).

Methods:

Var STR = '123 yes yes ';

Var strArr = STR. The split (");

Var count = 0;

For (strArr. Length) {* * * *}

........................... (not on the code, tired!!)

Revised:

var str = '123 is ';

var tmpStr = str.replace(/[u4e00-u9fa5]/gi,"aa");

//print 

tmpStr.length