编程篇(013)-已知有字符串 foo="get-element-by-id", 写一个 function 将其转化为驼峰表示法

var string = "get-element-by-id";

function combo(msg) {
    var arr = msg.split("-"); //split("-")以-为分隔符截取字符串，返回数组
    for (var i = 1; i < arr.length; i++) {
        arr[i] = arr[i].charAt(0).toUpperCase() + arr[i].slice(1);
    }
    msg = arr.join(""); //join()返回字符串
    return msg;
}
console.log(combo(string));