series.data数据更新时同步更新legend.data数据
const series_data = [
{value: 335, name: '股票'},
{value: 310, name: '债券'},
{value: 0, name: '基金'},
{value: 135, name: '现金'}
]
const legend_data = chart_data.map(e=>e.value?e.name:false).filter(Boolean)
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