<form id="target">  <select name="age">   <option value="age1">20</option>   <option value="age2" selected>21</option>  </select>  <input name="name" value="Cynthia">  <label>passsword</label>  <input type="password" name="password" value="123456">  <input type="hidden" name="salery" value="3333">  <textarea name="description" cols="15" rows="5">description</textarea>  <input type="checkbox" name="hobby" value="football" checked> Football  <input type="checkbox" name="hobby" value="basketball"> Basketball  <input type="radio" name="sex" value="Female" checked> Female  <input type="radio" name="sex" value="Male"> Male </form>

function serializeForm1(form){    var setForm = "";    for(var key in form){     if(form.hasOwnProperty(key)){      setForm += '"'+form[key].name+'"'+':'+'"'+form[key].value + '"'+',';    }   }   setForm = "{" + setForm.slice(0,setForm.length -1) + "}";   console.log(setForm);   // console.log(JSON.parse(setForm));   return JSON.parse(setForm);  }     // 調(diào)用  var oForm = document.getElementById('target');  console.log(serializeForm3(oForm));

 function serializeForm2(form) {   var parts = [];   for (var i = 0, i1 = form.elements.length; i < i1; i++) {    var field = form.elements[i];    switch (field.type) {     case 'select-one':     case 'select-multiple':      if (field.type.length) {       for (var j = 0, j1 = field.options.length; j < j1; j++) {        var option = field.options[j];        if (option.selected) {         var optionValue = '';         if (option.hasAttribute('value') && option.attributes['value'].specified) {          //specified表明是否有此屬性，有的話(huà)返回true，若定義了此屬性但尚未添加到元素中也返回true。          optionValue = option.value;         } else {          optionValue = optionValue.text;         }         parts.push(encodeURIComponent(field.name) + '=' + encodeURIComponent(optionValue));        }       }      }      break;     case undefined:     case 'file':     case 'submit':     case 'reset':     case 'button':      break;     case 'radio':     case 'checkbox':      if(!field.checked){       break;      }else{       parts.push(encodeURIComponent(field.name) + '=' + encodeURIComponent(field.dataset['index']));       break;      }     default:      if(field.name.length){       parts.push(encodeURIComponent(field.name) + '=' + encodeURIComponent(field.value));      }    }   }   return parts.join('&');  }     // 調(diào)用  var oForm = document.getElementById('target');    console.log(serializeForm2(oForm));

 function serializeForm3(form){   if(!form||form.tagName.toUpperCase()!='FORM'){    return false;   }   var res=[];   var tag,tagType,tagVal,tagName;   for(var i=0;i<form.length;i++){    tag=form[i];    tagType=form[i].type;    tagVal=form[i].value;    tagName=form[i].name;     var reg1=/['textarea'|'text'|'passsword'|'label']/g;    var reg2=/['radio'|'checkbox']/g;    var reg3=/['select']/g;    if(reg1.test(tagType)){     res.push(encodeURIComponent(tagName)+"="+encodeURIComponent(tagVal));    }else if(reg2.test(tagType)&&tag.checked){     res.push(encodeURIComponent(tagName)+"="+encodeURIComponent(tagVal));     }else if(reg3.test(tagType)){     for(var j=0;j<tag.options.length;j++){      if(tag.options[j].selected){      res.push(encodeURIComponent(tagVal)+"="+encodeURIComponent(tag.options[j].value||tag.options[j].text));       }     }    }else{}   }    return res.join(" & ");  }     // 調(diào)用  var oForm = document.getElementById('target');  console.log(serializeForm3(oForm));