wechat-miniprogram / wechat-miniprogram/computed
computed 属性第一次会返回 null
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- TypeScript
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Description
我按照如下方式使用 computed，但是第一次 state 会返回 null，导致我的组件警告提示，说传入了一个 null，但是需要 string
data: {
isConnected: true,
},
computed: {
text({ isConnected }) {
return isConnected ? "网络正常" : "网络异常";
},
state({ isConnected }) {
return isConnected ? "success" : "error";
},
},
lifetimes: {
attached() {
wx.onNetworkStatusChange((res) => {
this.setData({
isConnected: res.isConnected,
});
});
},
},
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Research direction
Start by reproducing the reported computed setup with the TypeScript example and inspect when the computed state value is initialized. Confirm that the first value is a string rather than null and that the component warning no longer occurs.
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Assessment
- Tech stack
- typescript
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100