当遇到cannot read property style of undefine的问题如下：
那就说明你设定的这个变量名为空
比如我在文档里写的属性名为list_box
但是我获取的属性名称写错了
这就造成list_box在文档中获取不到这个属性名称list_spark所以浏览器无法读出这个属性自然也无法读出它的样式
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