原生js实现获取form表单数据

//获取指定form中的所有的<input>对象  function getElements(formId) {      var form = document.getElementById(formId);      var elements = new Array();      var tagElements = form.getElementsByTagName('input');      for (var j = 0; j < tagElements.length; j++){        elements.push(tagElements[j]);     }     var tagElements = form.getElementsByTagName('select');      for (var j = 0; j < tagElements.length; j++){        elements.push(tagElements[j]);     }     var tagElements = form.getElementsByTagName('textarea');      for (var j = 0; j < tagElements.length; j++){         elements.push(tagElements[j]);     }    return elements;  }  //组合URL function serializeElement(element) {      var method = element.tagName.toLowerCase();      var parameter;      if(method == 'select'){        parameter = [element.name, element.value];     }    switch (element.type.toLowerCase()) {          case 'submit':          case 'hidden':          case 'password':          case 'text':        case 'date':        case 'textarea':               parameter = [element.name, element.value];             break;        case 'checkbox':          case 'radio':              if (element.checked){                parameter = [element.name, element.value];              }            break;           }      if (parameter) {         var key = encodeURIComponent(parameter[0]);         if (key.length == 0)             return;         if (parameter[1].constructor != Array)              parameter[1] = [parameter[1]];         var values = parameter[1];         var results = [];         for (var i = 0; i < values.length; i++) {              results.push(key + '=' + encodeURIComponent(values[i]));         }         return results.join('&');      }  }  //调用方法   function serializeForm(formId) {      var elements = getElements(formId);      var queryComponents = new Array();      for (var i = 0; i < elements.length; i++) {          var queryComponent = serializeElement(elements[i]);          if (queryComponent) {            queryComponents.push(queryComponent);          }     }      return queryComponents.join('&'); } 

最后通过serializeForm(formId);输入form的id名称即可实现，返回数据为

id=1&title=%E6%B4%BB%E5%8A%A8&time=2017-07-10&status=1&importance=0&desc=%E5%9C%A8%E4%BA%8C%E6%A5%BC%E5%8A%9E%E5%85%AC%E5%AE%A4%E5%BC%80%E4%BC%9A%EF%BC%8C%E4%B8%80%E7%82%B9%E9%92%9F

已经将数据编码