动态设置option中的title无效

[zhoufanglu]

Version

4.9.0

Steps to reproduce

option.title.text = xxx

What is expected?

改变title，图表标题改变

What is actually happening?

改变title，图表标题未改变

[echarts-bot]

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In the meanwhile, please make sure that you have posted enough image to demo your request. You may also check out the API and chart option to get the answer.

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[echarts-bot]

@zhoufanglu Please provide a demo for the issue either with https://codepen.io/Ovilia/pen/dyYWXWM , https://www.makeapie.com/editor.html or https://codesandbox.io/s/mystifying-bash-2uthz.

[zhoufanglu]

var container = document.getElementById('main');
var chart = echarts.init(container);
chart.setOption({
  title: {
          text: 'aa',
          left: 'left'
        },
  xAxis: {
    data: ['A', 'B', 'C']
  },
  yAxis: {
    
  },
  series: [{
    type: 'bar',
    data: [120, 200, 150]
  }]
});

const option = chart.getOption()
option.title.text = 'b'
chart.setOption(option)

我动态修改了title,却没有生效

[pissang]

getOption 返回的值是处理过的

option.title[0].text = 'b'