代碼如下:function clearForm(form) {  // iterate over all of the inputs for the form  // element that was passed in  $(':input', form).each(function() {    var type = this.type;    var tag = this.tagName.toLowerCase(); // normalize case    // it's ok to reset the value attr of text inputs,    // password inputs, and textareas    if (type == 'text' || type == 'password' || tag == 'textarea')      this.value = "";    // checkboxes and radios need to have their checked state cleared    // but should *not* have their 'value' changed    else if (type == 'checkbox' || type == 'radio')      this.checked = false;    // select elements need to have their 'selectedIndex' property set to -1    // (this works for both single and multiple select elements)    else if (tag == 'select')      this.selectedIndex = -1;  });};  

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