JavaScript 调用表单重置方法
1 history.go(0)
2 location.reload() （页面进行刷新，但为disabled的元素的值不会被清空）
3 location=location
4 location.assign(location)
5 location.replace(location)
6 from..reset() (页面不进行刷新，模拟单击对所调用表单重置按钮的单击)
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