js清空form表单中的内容

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//清空form选择function clearForm(id){     var formObj = document.getElementById(id);    if(formObj == undefined){         return;    }    for(var i=0; i<formObj.elements.length; i++){        if(formObj.elements[i].type == "text"){            formObj.elements[i].value = "";        }         else if(formObj.elements[i].type == "password"){             formObj.elements[i].value = "";         }         else if(formObj.elements[i].type == "radio"){             formObj.elements[i].checked = false;         }         else if(formObj.elements[i].type == "checkbox"){             formObj.elements[i].checked = false;         }         else if(formObj.elements[i].type == "select-one"){             formObj.elements[i].options[0].selected = true;         }         else if(formObj.elements[i].type == "select-multiple"){                 for(var j = 0; j < formObj.elements[i].options.length; j++){                 formObj.elements[i].options[j].selected = false;             }         }         else if(formObj.elements[i].type == "file"){             //formObj.elements[i].select();             //document.selection.clear();                          // for IE, Opera, Safari, Chrome             var file = formObj.elements[i];              if(file.outerHTML){                  file.outerHTML = file.outerHTML;              }else{                  file.value = "";  // FF(包括3.5)             }         }         else if(formObj.elements[i].type == "textarea"){             formObj.elements[i].value = "";         }     }}
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