Determine the length of the string (optimized version) and occupies two characters in Chinese

I just saw the js method I wrote before: calculate the length of the string (2 characters in Chinese).

method:

var str = '123 Yes Yes';

var strArr = str.split('');

var count = 0;

for(strArr.length){ **** }

………………………… (No more code, I'm tired!!)

After modification:

The code copy is as follows:

var str = '123 Yes Yes';

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

//print

tmpStr.length