javascript - Function to count the number of words?

Question

Numbers, letters, and space symbols represent one digit, and Chinese characters represent two digits. How to write a function to calculate the number of digits?

Answer 1

Use ASCII code to judge

Answer 2

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