注意，如此时未指定文档长度，则打印预览时不会产生纵向滚动条。
Note that if the document length is not specified by this time, a scroll bar is not displayed during print preview.
需要不断的横向或者纵向拖动滚动条，使得这些方法效率很低并且难以使用。
The need to constantly scroll horizontally and vertically makes these methods inefficient and difficult to use.
需要不断的横向或者纵向拖动滚动条，使得这些方法效率很低并且难以使用。
The need to constantly scroll horizontally and vertically makes these methods inefficient and difficult to use.
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