如何以特定方式反转字符串

Question

This is a very specific question and I want to reverse a string in this way however I don't know how to go about it.

What i want to do is take a word lets say 'hello'. olleh

and take the first and last letters and output 'oellh' then doing the same thing for the next two characters so 'e' and 'l' which would then output 'olleh'.

So to summaries this I need to reverse the first and last character and then the same thing for the second characters until i get to the middle character.

This must use a for loop.

        reverse('hello');

    function reverse(string) {

        var character = [];

        for (var i = string.length -1; i >= 0; i--) {
            character.push(string[i]);
        }

        console.log(character.join(""));

    }

Let me know if this needs further explanation

Answer 1

This might do the trick:

function replaceAt(string, index, character){
    return string.substr(0, index) + character + string.substr(index+character.length);
}

function reverse(string) {
    var len = string.length;
    len = len/2;
    var s = string;

    for (var i = 0; i < len ; i++)
    {
        var m = s[string.length-i-1];
        var k = s[i];
        s = replaceAt(s,i, m);
        s = replaceAt(s, string.length-i-1, k);       
    }
       return s;

}

Answer 2

您可以轻松地反转字符串：

"hello".split("").reverse().join("")