初始化进入页面如何修改data数据并进行页面判断渲染？

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初始化进入页面如何修改data数据并进行页面判断渲染？How to modify the data data and perform page judgment and rendering when initializing the entry page?

Now I judge whether there is a local value and display different pages. Now I display what the data value is. The modification in onload below is completely invalid. What is the reason for this? Is it not allowed to change,

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