<span class="action-btn" ref="showDoc" :class="showDoc ? 'hide': 'show'" @click="handShowDoc" @mousedown="mouseDownHandDoc($event)" @mouseup="mouseUpHandDoc($event)">{{ showDoc ? '隐藏' : '显示' }}文档</span>

export default {
    data () {
        moveDoc: { //显示文档初始位置
                x: null,
                y: null
            },
         moveTools:{ //显示工具栏位置
                x: null,
                y: null
         }
    },
    methods:{
        handShowDoc(){ //判断显示文档是点击事件还是拖拽事件
            let isClick = this.$refs.showDoc.getAttribute('flag')
            if(isClick ==='true') this.showDoc=!this.showDoc
            else return false
        },
        mouseDownHandDoc(event){//显示文档的鼠标按下事件
            this.moveDoc.y = event.pageY - this.$refs.showDoc.offsetTop
            event.currentTarget.style.cursor = 'move'
            window.onmousemove = this.mouseMoveHandDoc
            this.$refs.showDoc.setAttribute('flag', false)
            const firstTime = new Date().getTime()
            document.onmouseup = () => {
                document.onmousemove = null
                document.onmouseup = null
                // onmouseup 时的时间，并计算差值
                const lastTime = new Date().getTime()
                if ((lastTime - firstTime) < 200) {
                    this.$refs.showDoc.setAttribute('flag', true)
                }
            }
        },
        mouseMoveHandDoc (event) { //显示文档的鼠标移动事件
            let moveTop = event.pageY - this.moveDoc.y + 'px'
            this.$refs.showDoc.style.top = moveTop
        },
        mouseUpHandDoc(event){ //显示文档的鼠标抬起事件
            window.onmousemove = null
            event.currentTarget.style.cursor = 'move'
        },
    }
}