jQuery :submit 选择器
定义和用法
：submit 选择器选择 type=submit 的 button 和 input 元素。
如果 button 元素没有定义类型，大多数浏览器会将其用作 type=submit 的按钮。
提示：使用 input:submit 作为选择器将不会选择 button 元素。
语法
$(":submit")
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