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//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 a ='Rome was not built in a day';
b =a.replace(/\s/g);//去掉所有的空格
var sum =0;
for(var i of a)
{
    sum++;
}
document.write('Rome was not built in a day字符串的个数有'+sum+'个');