react String保留n位小数

我有很多列的数据，需要把小数精简一下：

? [
{ title: <span style="color:#abe338">&quot;年份&quot;</span>, dataIndex: <span style="color:#abe338">&quot;year&quot;</span> },
{ title: <span style="color:#abe338">&quot;初始库存量&quot;</span>, dataIndex: <span style="color:#abe338">&quot;bank_count&quot;</span> },
{ title: <span style="color:#abe338">&quot;总排放&quot;</span>, dataIndex: <span style="color:#abe338">&quot;result&quot;</span> }
] : [
{ title: <span style="color:#abe338">&quot;年份&quot;</span>, dataIndex: <span style="color:#abe338">&quot;year&quot;</span> },
{ title: <span style="color:#abe338">&quot;初始库存量&quot;</span>, dataIndex: <span style="color:#abe338">&quot;bank_count&quot;</span> },
{ title: <span style="color:#abe338">&quot;维修排放&quot;</span>, dataIndex: <span style="color:#abe338">&quot;emission_operation&quot;</span> }
];

修改上面的内容是不行的，需要在render里判断：

{columns.map((<span style="color:#f5ab35">column, index</span>) =&gt; (
<span style="color:#ffa07a">&lt;</span><span style="color:#ffa07a">td</span><span style="color:#ffa07a"> </span><span style="color:#ffa07a">key</span><span style="color:#ffa07a">=</span><span style="color:#abe338">{index}</span><span style="color:#ffa07a">&gt;</span>
{column.dataIndex === &quot;year&quot;
? item[column.dataIndex] // 对于 &quot;year&quot; 列，不进行小数位数处理
: parseFloat(item[column.dataIndex]).toFixed(2) // 对于其他列，保留两位小数
}
<span style="color:#ffa07a">&lt;/</span><span style="color:#ffa07a">td</span><span style="color:#ffa07a">&gt;</span>
))}