前端消息提示两次后第一次提示关不掉

(function () {
    window.Message = class Message {
        constructor(type, message, timerout) {
            this.dom = null;
            this.type = type;
            this.message = message;
            this.timerout = timerout;
        }
        showMessage() {
            let writediv = document.createElement("div");
            writediv.setAttribute("class", "wr")
            writediv.innerHTML = this.message;
            this.dom = writediv;
            switch (this.type) {
                case "success":
                    writediv.setAttribute("class", "wr1");
                    break;
                case "waring":
                    writediv.setAttribute("class", "wr2");
                    break;
                case "error":
                    writediv.setAttribute("class", "wr3");
                    break;
            }
            document.body.append(writediv);
            setTimeout(() => {
                this.hiddenMessage();
            }, this.timerout);
        }
        hiddenMessage() {
            document.body.removeChild(this.dom);
        }
    }
})()

报错内容：Uncaught DOMException: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node.

报错截图：

现在好多组件都有这种提示框，拿过来改改样式就很方便了，为啥还要js封装这种意义不大的东西呢

this.$message({
     showClose: true,
     type: 'warning',
     message: '提示信息'
})

这种更香

The node to be removed is not a child of this node. 应该是移除的时候有问题呢, 第一次执行的时候已经移除了,第二次再移除就有问题了 增加个判断把 如果不为空再移除