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

<!--用来清空表单数据-->
<input type="reset" name="reset" style="display: none;" />

$("input[type=reset]").trigger("click");