Retrieves text contents matching a given selector expression. If you provide one matching more than one element, their textual contents will be concatenated.
获取一个给定的选择器表达式匹配的文本内容，如果他们匹配了不止一个元素，他们的文本内容将被连接起来。
The event selector string should be a valid XPath expression that is used by the CEI server to match events.
事件选择器字符串应当是有效的XPath表达，CEI服务器利用它来匹配事件。
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