Live broadcast platform development, flexible menu, and freely adjust the horizontal size of the menu bar

Live platform development , Retractable menu , Randomly adjust the size of the menu bar horizontally to achieve the relevant code

/* Drag area div style */
.resize {
    
    cursor: col-resize;
    position: relative;
    // top: 45%;
    top: 400px;
    background-color: #d6d6d6;
    border-radius: 5px;
    margin-top: -10px;
    width: 10px;
    height: 50px;
    background-size: cover;
    background-position: center;
    font-size: 32px;
    color: white;
}
/* Drag and drop area mouse over style */
.resize:hover {
    
    color: #444444;
}
// The left menu sets the percentage width , Easy drag and drop adaptive  .main_menu {
    
    width:22%; /* Right initialization width */
    height: 100%;
    background: #BF334E!important;
    box-shadow: 0px 0px 0px 0px rgba(0, 0, 0, 0.11);
}

methods Drag and drop function inside ：

//  Drag events  dragControllerDiv() {
    
            var resize = document.getElementsByClassName('resize')
            var left = document.getElementsByClassName('left')
            var mid = document.getElementsByClassName('mid')
            var box = document.getElementsByClassName('box')
            for (let i = 0; i < resize.length; i++) {
    
                //  Mouse down event  resize[i].onmousedown = function (e) {
    
                    // Color change reminder  resize[i].style.background = '#818181' var startX = e.clientX resize[i].left = resize[i].offsetLeft //  Mouse drag events  document.onmousemove = function (e) {
    
                        console.log(' The mouse click ')
                        var endX = e.clientX
                        var moveLen = resize[i].left + (endX - startX - 270) // （endx-startx）= Distance traveled .resize[i].left+ Distance traveled = The last width of the left area 
                        var maxT = box[i].clientWidth - resize[i].offsetWidth - 270//  Container width  -  The width of the left area  =  The width of the right area 
                        console.log(moveLen,maxT)
                        if (moveLen < 32) moveLen = 270 //  The minimum width of the left area is 32px
                        if (moveLen > maxT - 150) moveLen = maxT - 650 // The minimum width of the right area is 150px
                        resize[i].style.left = moveLen //  Set the width of the left area 
                        for (let j = 0; j < left.length; j++) {
    
                            console.log( left[j].style)
                            left[j].style.width = moveLen + 'px'
                            mid[j].style.width = box[i].clientWidth - moveLen - 10 + 'px'
                        }
                    }
                    //  Mouse Up Event  document.onmouseup = function (evt) {
    
                        console.log(' Mouse up ')
                        // Color recovery 
                        resize[i].style.background = '#d6d6d6'
                        document.onmousemove = null
                        document.onmouseup = null
                        resize[i].releaseCapture && resize[i].releaseCapture() // When you no longer need to continue to get mouse messages, you should call ReleaseCapture() release 
                    }
                    resize[i].setCapture && resize[i].setCapture() // This function sets the mouse capture in the specified window belonging to the current thread 
                    return false
                }
            }
        },

mounted It calls ：

    mounted() {
    
         this.dragControllerDiv()
    },

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