//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 countchars='Rome was not built in a day';
countchars=countchars.replace(/ /g,"k");
console.log(countchars);
var sum=0;
for(var i of countchars){
if(i=="k"){
sum=sum-1;
}
sum++;
}
console.log(sum);
document.write("There are " +sum + " characters in sentence. ");
<!DOCTYPE html>
<html>
<head>
<meta charsrt="utf-8" />
<title></title>
</head>
<body>
<script>
</script>
</body>
</html>