JavaScript獲取請求參數

<script type="text/javascript">
    //獲取請求參數
    function paramsMap() {
        var url = window.location.href;
        var obj = {};
        var reg = /[?&][^?&]+=[^?&]+/g;
        var arr = url.match(reg);
        if (arr === null) return obj;
        arr.forEach(function (item) {
            var tempArr = item.substring(1).split('=');
            var key = decodeURIComponent(tempArr[0]);
            var val = decodeURIComponent(tempArr[1]);
            obj[key] = val;
        });
        return obj;
    }
</script>

var params = paramsMap()["params"];