//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) document.write('字符串的个数是'+sum)