写一个将当前页面 URL 中的 get 参数解析成一个对象的方法。

function getQuery () {
    var args = {};
    var query = window.location.search.substring(1);
    var pairs = query.split("&");
    for(var i = 0; i < pairs.length; i++) {
        var pos = pairs[i].indexOf('=');
        if (pos == -1) continue;
        var argname = pairs[i].substring(0, pos);
        var value = pairs[i].substring(pos+1);
        value = decodeURIComponent(value);
        args[argname] = value;
    }
    return args;
}
or
function getQuery () {
    var ret = {},
        seg = location.search.replace(/^\?/,'').split('&'),
        len = seg.length, i = 0, s;
    for (;i<len;i++) {
        if (!seg[i]) { continue; }
        s = seg[i].split('=');
        ret[s[0]] = decodeURIComponent(s[1]);
    }
    return ret;
}