vue.js - 将vue2.x的代码迁移到vue3.x,遇到v-model模块中“task”prop的Unexpected mutation
问题描述
我在将项目从vue2.x迁移到vue3.0时使用了Composition API,但是页面不能正常工作,在vue3.0环境提示我出现“Unexpected mutation of "task" prop”错误,我要知道如何编写正确的 Compos API 这是 Vue2.x 代码
<template>
<transition name="fade">
<div class="task" v-if="!task.deleted">
<input :id="id" type="checkbox" v-model="task.done" />
<label :for="id">{{ task.title }}</label>
<transition name="fade">
<span
class="task_delete"
v-show="task.done"
@click="deleteTask({ task })"
>
<i class="fa fa-trash"></i>
</span>
</transition>
</div>
</transition>
</template>
<script>
import { mapMutations } from "vuex";
let GID = 1;
export default {
props: {
task: {
type: Object,
required: true,
},
},
data() {
return {
id: `task-${GID++}`,
};
},
methods: {
...mapMutations(["deleteTask"]),
},
};
</script>
<style lang="scss">
.task {
display: flex;
padding: 12px 0;
border-bottom: 1px solid #eee;
font-size: 14px;
}
.task input {
display: none;
}
.task label {
flex: 1;
line-height: 20px;
}
.task label:before,
.task label:after {
content: "";
display: inline-block;
margin-right: 20px;
margin-top: 1px;
width: 14px;
height: 14px;
vertical-align: top;
}
.task label:before {
border: 1px solid #ccc;
border-radius: 2px;
background-color: white;
}
.task label:after {
content: "\f00c";
position: relative;
display: none;
z-index: 10;
margin-right: -16px;
width: 10px;
height: 10px;
padding: 3px;
border-radius: 2px;
font: normal normal normal 10px/1 FontAwesome;
color: white;
background-color: #ccc;
float: left;
}
.task input:checked + label:after {
display: inline-block;
}
.task_delete {
padding: 0 10px;
color: #ccc;
font-size: 16px;
}
.fade-leave-to,
.fade-enter {
opacity: 0;
}
.fade-enter-to,
.fade-leave {
opacity: 1;
}
.fade-enter-active,
.fade-leave-active {
transition: all 0.3s ease;
}
</style>
这是 Vue3.0 代码使用 Composition API,但不起作用
<template>
<transition name="fade">
<div class="task" v-if="!data.task.deleted">
<input :id="id" type="checkbox" v-model="data.task.done" />
<label :for="id">{{ data.task.title }}</label>
<transition name="fade">
<span
class="task_delete"
v-show="data.task.done"
@click="deleteTask({ task })"
>
<i class="fa fa-trash"></i>
</span>
</transition>
</div>
</transition>
</template>
<script>
import { reactive } from "vue";
import { mapMutations } from "vuex";
let GID = 1;
export default {
name: "Task",
props: {
task: {
type: Object,
required: true,
},
},
setup(props) {
const data = reactive({
task: props.task,
id: `task-${GID++}`,
});
return { data };
},
methods: {
...mapMutations(["deleteTask"]),
},
};
</script>
<style lang="scss">
.task {
display: flex;
padding: 12px 0;
border-bottom: 1px solid #eee;
font-size: 14px;
}
.task input {
display: none;
}
.task label {
flex: 1;
line-height: 20px;
}
.task label:before,
.task label:after {
content: "";
display: inline-block;
margin-right: 20px;
margin-top: 1px;
width: 14px;
height: 14px;
vertical-align: top;
}
.task label:before {
border: 1px solid #ccc;
border-radius: 2px;
background-color: white;
}
.task label:after {
content: "\f00c";
position: relative;
display: none;
z-index: 10;
margin-right: -16px;
width: 10px;
height: 10px;
padding: 3px;
border-radius: 2px;
font: normal normal normal 10px/1 FontAwesome;
color: white;
background-color: #ccc;
float: left;
}
.task input:checked + label:after {
display: inline-block;
}
.task_delete {
padding: 0 10px;
color: #ccc;
font-size: 16px;
}
.fade-leave-to,
.fade-enter {
opacity: 0;
}
.fade-enter-to,
.fade-leave {
opacity: 1;
}
.fade-enter-active,
.fade-leave-active {
transition: all 0.3s ease;
}
</style>
解决方案
我认为问题在于您在复选框上使用 v-model 进行道具,它会直接更改道具值而 vue 不允许。尝试通过发出事件手动更新道具值。而且您不需要在子组件中使用具有反应性的道具,但需要在父组件中反应性道具
<input :id="id" type="checkbox" v-value="task.done" @change="updateCheckbox($event)")/>
在脚本中:
export default {
name: "Task",
props: {
task: {
type: Object,
required: true,
},
},
emits: ['updateCheckbox'],
setup(props) {
const data = reactive({
id: `task-${GID++}`,
});
return { data };
},
methods: {
updateCheckbox(e) {
this.$emit('updateCheckbox', e.target.value)
}
},
};
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