獲取url上某個參數的值

function getUrlParam(name) { //獲取url上某個參數的值
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
    var r = window.location.search.substr(1).match(reg);
    if (r != null) {
        return decodeURIComponent(r[2]);
    }

    return '';
}