To use graphics instead of text to express the open and closed states, alter the code that changes the innerHTML value of the spinner object to specify an image tag instead of text.

为使用图形取代文本来表示展开和关闭状态，更改代码，改变微调控制项对象的innerhtml值，使其指定一个图像标记而非文本。

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To use graphics instead of text to express the open and closed states, alter the code that changes the innerHTML value of the spinner object to specify an image tag instead of text.

为使用图形取代文本来表示展开和关闭状态，更改代码，改变微调控制项对象的innerhtml值，使其指定一个图像标记而非文本。

youdao