一、页面

<div class="resize-handle" @mousedown="startResizing">⋮</div>

二、js

  data() {
        return {
            showSideBar: true,
            leftPaneWidth: 63, // 左侧区域的初始宽度
            isResizing: false, // 标记是否正在调整大小
            startX: 0, // 调整大小开始时的鼠标位置
            maxWidth: 80, // 最大可调整宽度 
        }
    },
  
    methods: {
        startResizing(event) {
            this.isResizing = true;
            this.startX = event.clientX; // 记录调整大小开始时的鼠标位置
        },
        handleMouseMove(event) {
            if (this.isResizing) {
                let offsetX = event.clientX - this.startX; // 计算鼠标位置相对于调整大小开始时的偏移量
                let newWidth = this.leftPaneWidth + offsetX; // 计算新的宽度
                this.leftPaneWidth = Math.min(this.maxWidth, Math.max(0, newWidth)); // 更新左侧区域的宽度，限制在 [0, maxWidth] 的范围内
                this.startX = event.clientX; // 更新调整大小时的鼠标位置，用于下一次计算偏移量
            }
        },
        stopResizing() {
            this.isResizing = false;
        },
    },
    mounted() {
        document.addEventListener("mousemove", this.handleMouseMove);
        document.addEventListener("mouseup", this.stopResizing);
    },
    beforeUnmount() {
        document.removeEventListener("mousemove", this.handleMouseMove);
        document.removeEventListener("mouseup", this.stopResizing);
    },
}

 

三、样式

<style>
.container {
    display: flex;
    height: 100vh;
}

.left-pane {
    flex: 0 0 auto;
    background-color: #f1f1f1;
    /* overflow: auto; */
}

.resize-handle {
    flex: 0 0 px;
    cursor: col-resize;

    cursor: col-resize;
    float: right;
    position: relative;
    top: 45%;
    background-color: #d6d6d6;
    border-radius: 5px;
    margin-top: -10px;
    width: 8px;
    height: 41px;
    background-size: cover;
    background-position: center;
    z-index: 99999;
    font-size: 27px;
    color: white;
}

.resize-handle:hover {
    color: #444444;
}

.right-pane {
    flex: 1 1 auto;
    background-color: #f9f9f9;
}
</style>