[echarts] line bar stack相互切换

 toolbox: {
        right: '10%',
        // 自定义工具提示框
        tooltip: {
            show: true,
            trigger: 'axis',
            formatter: function(param) {
                return "
" + param.title + '按钮' + "
";
            },
        },
        // 隐藏工具标题
        showTitle: false,
        feature: {
            magicType: {
                type: ['line', 'bar','stack' ],

            },

        }
    },