vue+element el-table拉动每列的宽度，并保存到cookie里

1.在表格上写@header-dragend=“surverWidth”

2.表头造成数组

获取cookies里的数据

surverWidth(newWidth, oldWidth, column, event){
            setTimeout(() => {
                // console.log(newWidth, oldWidth, column, event)
                var applyTableColWidths = []
                var applyTable = document.getElementById('applyTable')
                var applyTableColgroup = applyTable.getElementsByTagName('colgroup')[0]
                var applyTableCol = applyTableColgroup.getElementsByTagName('col')
                for (var i = 0; i < applyTableCol.length; i++) {
                    applyTableColWidths.push(applyTableCol[i].width)
                }
                // console.log(applyTableColWidths)
                // localStorage.setItem('applyTableColWidths', JSON.stringify(applyTableColWidths))
                this.setCookie('applyTableColWidths',JSON.stringify(applyTableColWidths),30)把对应每列的数组宽度存到cookie里
            }, 100)
        },
        getTableColWidth () {
            var self = this
            var tableWidth =self.getCookie('applyTableColWidths')
            if (tableWidth) {
                for (var item = 0; item < self.tableColumn.length; item++) {
                        self.tableColumn[item].width = JSON.parse(tableWidth)[item]
                    }
            }
        },
        setCookie: function (cname, cvalue, exdays) {
            var d = new Date();
            d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
            var expires = 'expires=' + d.toUTCString();
            document.cookie = cname + '=' + cvalue + "; " + expires;
        },
        getCookie: function (cname) {
            var name = cname + '=';
            var ca = document.cookie.split(';');
            for (var i = 0; i < ca.length; i++) {
               var str=ca[i].split('=')
               if (str[0].trim() === 'applyTableColWidths') {
                    return str[1];
                }
            }
            return ""
        },