How can i remove the null from textarea when request.GetAttribute is null, and how can i modify the visibility of the label from the servlet? On the input textarea it doesn't show the request.getattribute value, and on the output textarea it shows the value but when the request.getattirbute is null, null is printed on the textarea and i want to remove it, how?How can i remove the null from textarea when re
阅读背景：
当request.GetAttribute为null时，如何从textarea中删除null，以及如何从servlet修改标签的可见性
来源：互联网
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