用JS判断字符串是否回文

var str = "121";

var length = str.length;

var flag = true;

for(var i = 0,j= length-1; i<length/2;i++,j--){

    if(str[i] == str[j]){ 

        continue;

    }

       else{

            flag = false;

            break;

        }

}

if(flag){

    console.log(str+'is huiwen');

}

else{

    console.log(str+'is not huiwen');

}