表格可拖拉列改变列大小（使用的时候将youElement全部替换称你要添加这个效果的元素，需是jqery的选择器格式，如：$("table th/td")）

$(function () {
    var isMouseDown = false;
    var currentTh = null;
    youElement.bind({
        mousedown: function (e) {
            var $th = $(this);
            var left = $th.offset().left; //元素距左
            var rightPos = left + $th.outerWidth();
            if (rightPos - 4 <= e.pageX && e.pageX <= rightPos) {
                isMouseDown = true;
                currentTh = $th;
                youElement.css('cursor', 'ew-resize');

                //创建遮罩层，防止mouseup事件被其它元素阻止冒泡，导致mouseup事件无法被body捕获，导致拖动不能停止
                var bodyWidth = $('body').width();
                var bodyHeight = $('body').height();
                $('body').append('<div id="mask" style="opacity:0;top:0px;left:0px;cursor:ew-resize;position:absolute;z-index:9999;width:' + bodyWidth + 'px;height:' + bodyHeight + 'px;"></div>');
            }
        }

    });

    $('body').bind({
        mousemove: function (e) {
            //移动到column右边缘提示
            youElement.each(function (index, eleDom) {
                var ele = $(eleDom);
                var left = ele.offset().left; //元素距左
                var rightPos = left + ele.outerWidth();
                if (rightPos - 4 <= e.pageX && e.pageX <= rightPos) { //移到列右边缘
                    ele.css('cursor', 'ew-resize');
                } else {
                    if (!isMouseDown) { //不是鼠标按下的时候取消特殊鼠标样式
                        ele.css("cursor", "auto");
                    }
                }
            });

            //改变大小
            if (currentTh != null) {
                if (isMouseDown) { //鼠标按下了，开始移动
                    var left = currentTh.offset().left;
                    var paddingBorderLen = currentTh.outerWidth() - currentTh.width();
                    currentTh.width((e.pageX - left - paddingBorderLen) + 'px');
                    var s = currentTh[0];
                    while(s.tagName!="TABLE"){
                        s=s.parentNode;
                    }
                    for (let i = 0; i <s.rows.length ; i++) {
                        $(s.rows[i].cells[currentTh[0].cellIndex]).width((e.pageX - left - paddingBorderLen) + 'px');
                    }
                }
            }
        },
        mouseup: function (e) {
            isMouseDown = false;
            currentTh = null;
            youElement.css('cursor', 'auto');
            $('#mask').remove();
        }
    });
});

标签：body,jqery,需是,currentTh,th,var,选择器,isMouseDown,left
来源： https://www.cnblogs.com/fei-le/p/11583730.html