[英]Nuxt - composition api and watchers
我正在嘗試查看組件中的一些警告
import VueCompositionApi, { watch } from '@vue/composition-api';
import useWarning from '@composables/warnings';
Vue.use(VueCompositionApi);
setup () {
const { activeWarnings } = useWarning();
watch(activeWarnings, () => {
console.log('called inside on update')
});
}
在我的作文 function 中,我只是推入反應陣列以模擬警告。
import { reactive } from '@vue/composition-api';
export default function useWarnings () {
const activeWarnings = reactive([]);
setInterval(() => {
fakeWarning();
}, 3000);
function fakeWarning () {
activeWarnings.push({
type: 'severe',
errorCode: 0,
errorLevel: 'red',
}
);
}
return { activeWarnings };
這在 Vue 2 中根本不起作用嗎? 有解決方法嗎? activeWarnings 確實在我的組件中更新 - 我看到數組已填滿,但從未調用過此觀察程序。
由於activeWarnings
是一個數組,您應該添加immediate:true
選項:
const { activeWarnings } = useWarning();
watch(activeWarnings, () => {
console.log('called inside on update')
},{
immediate:true
});
或者
const { activeWarnings } = useWarning();
watch(()=>activeWarnings, () => {
console.log('called inside on update')
},{
immediate:true
});
但我推薦以下語法:
import { reactive,toRef } from '@vue/composition-api';
export default function useWarnings () {
const state= reactive({activeWarnings :[]});
setInterval(() => {
fakeWarning();
}, 3000);
function fakeWarning () {
state.activeWarnings.push({
type: 'severe',
errorCode: 0,
errorLevel: 'red',
}
);
}
return { activeWarnings : toRef(state,'activeWarnings')};
然后:
const { activeWarnings } = useWarning();
watch(activeWarnings, () => {
console.log('called inside on update')
},{
immediate:true
});
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