有时候watch监听不到数据，需要跟computed配合

watch: {
    A() {
    }
    B() {
    }
    changeDate: {
        handler: function(val, oldval) {
            if(val.A && val.B) { 操作}
        }
    }
}

computed: {
    changeDate() {
        const {A, B} = this;
        return {
          A,
          B
         }
    }
}

vue 之 watch + computed 搭档
有时候watch监听不到数据，需要跟computed配合
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