Error in nextTick: “TypeError: Cannot read property ‘xxx‘ of undefined“

报这个错主要是因为子组件还没加载完成就对子组件进行赋值，推荐使用第一个

     this.$nextTick( ()=> {//修改子组件的内容});//或setTimeout(() => {//修改子组件的内容}, 50);

父组件传值给子组件，子组件不能直接修改，会报错

//子组件修改父组件的值
this.$emit('名字','值');//子组件调用父组件的方法
this.$emit('方法', val)
//或
this.$parent.fatherMethod();
//或
<child :fatherMethod="fatherMethod"></child>props: {fatherMethod: {type: Function,default: null}},//父组件修改子组件的值
<tag ref="xxx" @b='b'></tag>
this.$refs.xxx.a = 1//父组件调用子组件的方法
this.$refs.xxx.b()

watch中设置参数说明：有变化才能被监听
deep：是否深度监听
immediate：是否在页面初始化时就启用，true：是

//监听files变化watch: {files: {handler (newValue, oldValue) {console.log(newValue)this.fileList = newValue},deep: true // 默认值是 false，代表是否深度监听}
}

//监听对象的变化
data() {return {files: {name: 'demo'}   }
},
watch: {files: {handler(newValue, oldValue) {console.log(newValue)},deep: true}
}

//监听对象的具体属性
data() {return {files: {name: 'demo'} }
},
computed: {filesName() {return this.files.name}
},
watch: {filesName(newValue, oldValue) {console.log(newValue)}
}

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