计算文字的个数函数？

Question

数字字母空格符号代表一位，汉字表示二位，怎么写个函数计算位数？

Answer 1

var i = 0;var num=0;while (i<str.length) {&nbsp; &nbsp; if(str.charCodeAt(i) < 256) {&nbsp; &nbsp; &nbsp; &nbsp;num++&nbsp; &nbsp; }&nbsp; &nbsp; else{&nbsp; &nbsp; &nbsp; &nbsp;num+=2;&nbsp; &nbsp; }&nbsp; &nbsp; i++;}console.log(num)