原生js实现获取form表单数据代码实例

//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('&'); } 

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