This method is useful when parsing element-only content; if it encounters non-white-space text before a tag is found (other than comments or processing instructions), it throws an exception.

该方法在解析只含元素的内容时很有用，如果在发现标记之前遇到非空白文本(不包括注释或处理指令)，就会抛出异常。

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When clicked, this trigger throws a click event, which is caught by the tag event handler.

当被点击时，该trigger抛出click事件，该事件由标记事件处理程序捕捉。

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