同一page页面重复打开时,页面js里声明的变量会互相污染?

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同一page页面重复打开时,页面js里声明的变量会互相污染?When the same page is opened repeatedly, the variables declared in the page js will pollute each other?

For example, the "that" variable in the following code fragment, after the top page is closed, the "that" point in the bottom page becomes the closed page. Is this a bug in a small program or the current rule? If it is a known rule, does the official need to improve it? https://developers.weixin.qq.com/s/mqa4fHme7ZnX

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