从浏览器的url中获取查询字符串的参数

正则表达式：

function getQuery(name){
    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
    var r = window.location.search.substr(1).match(reg);
    if(r != null)
        return decodeURI(r[2]);
    return null;
}

截取：

function fn() {
    var url = decodeURI(window.location.href);
    var args = url.split('?');
    if (args[0] === url)
        return false;
    var arr = args[1].split('&');
    var obj = {};
    for (var i = 0; i < arr.length; i++) {
        var arg = arr[i].split('=');
        obj[arg[0]] = arg[1];
    }
    return obj;
}