Method "computed" has type "object" in the component definition. Did you reference the function

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  Method “computed” has type “object” in the  component definition. Did you reference the function correctly?

意思是：
方法“computed”在组件定义中具有类型“object”。你正确地引用了函数吗？
出现这样的问题就是 将methods方法报裹住了computed

computed: { 
        carId() { 
            if(this.addForm.goods_cat.length===3){ 
                return this.addForm.goods_cat[2]
                console.log( this.addForm.goods_cat);

            }
            return null
        }

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