fix: 修复downloadTask中回调注册多次导致无法一次取消问题 #542
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这个 PR 做了什么? (简要描述所做更改)
downloadTask中回调注册类型为数组,点击多次会导致注册多次,将注册类型改为一个变量,每次注册只会更新,
点击多次只会注册一个回调,取消回调只需要点击一次即可
这个 PR 是什么类型? (至少选择一个)
这个 PR 涉及以下平台: