SOURCE

//如果有一个字符串"Rome was not built in a day"
//请用程序统计该字符串中字符的个数，不允许使用字符串对象的length属性
var str = 'Rome was not built in a day'
str = str.replace(/\s/g, '')
console.log(str)
var sum = 0
for (var i of str) {
    sum++
}
console.log(sum)