function serialize(form) {    var parts = [],            elems = form.elements,            i = 0,            len = elems.length,            filed = null;    for (; i < len; i++) {        filed = elems[i];        switch (filed.type) {            case "select-one":            case "select-multiple":                if (filed.name.length) {                    var j = 0,                            opt,                            optLen = filed.options.length;                    for (; j < optLen; j++) {                        opt = filed.options[j];                        if (opt.selected) {                            parts.push(encodeURIComponent(filed.name) + "=" + encodeURIComponent(opt.value));                        }                    }                }                break;            case undefined:            case "submit":            case "reset":            case "file":            case "button":                break;            case "radio":            case "checkbox":                if (!filed.checked) {                    break;                }            default:                if (filed.name.length && filed.value) {                    parts.push(encodeURIComponent(filed.name) + "=" + encodeURIComponent(filed.value));                }        }    }    return parts.join("&");}

  function serialize(form) {        var formData = http://www.mamicode.com/new FormData(form),            getValue = formData.entries(),            parts = [];        for (var pair of getValue) {            parts.push(pair[0] + "=" + pair[1]);        }        return parts.join("&");    }