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修复由 chromium 浏览器 input输入框 bug导致的内存泄漏问题 #3629

@q269384828

Description

@q269384828

https://github.com/vuejs/core/issues/14170, input 输入框聚焦后销毁, 会内存泄漏。 chromium 的issues记录单。https://issues.chromium.org/issues/342247579

为解决该问题 , 可以在组件卸载前将input框 focus到其他input中, 例如

    onBeforeUnmount(() => {
      const fakeInput = document.createElement('input')
      fakeInput.focus();
      fakeInput.blur();
      fakeInput.remove();
    })

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