resize方法为什么只改变高度

echarts用resize方法，高度自适应变化，但宽度不变，是什么原因呢

```javascript
(function(){
    let myChart = echarts.init(document.querySelector('.line'));
    let option = {
        grid: {
            left: "0%",
            top: "10px",
            right: "0%",
            bottom: "4%",
            containLabel: true
        },
        xAxis: {
          type: 'category',
          data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
        },
        yAxis: {
          type: 'value'
        },
        series: [
          {
            data: [150, 230, 224, 218, 135, 147, 260],
            type: 'line'
          }
        ]
      };
      myChart.setOption(option);
      window.addEventListener('resize',function () {
        myChart.resize();
        });
})();

```

你肯定定死了.line的宽度