js 获取html加载的参数？file=123&time=2021

<script>
    function GetArgsFromHref(sHref, sArgName) {
        var args = sHref.split("?");
        var retval = "";

        if (args[0] == sHref) /*参数为空*/ {
            return retval; /*无需做任何处理*/
        }
        var str = args[1];
        args = str.split("&");
        for (var i = 0; i < args.length; i++) {
            str = args[i];
            var arg = str.split("=");
            if (arg.length <= 1) continue;
            if (arg[0] == sArgName) retval = arg[1];
        }
        return retval;
    }

    var urlinfo = window.location.href;  //获取当前页面的
    var test = GetArgsFromHref(urlinfo, "test");
    alert(test);

</script>