小编Yam*_*ine的帖子

我如何通过衬衫尺寸组织重新安排我的阵列:

[
  { shirt_id: 1, size: "small" },
  { shirt_id: 1, size: "medium" },
  { shirt_id: 1, size: "large" },
  { shirt_id: 2, size: "medium" },
  { shirt_id: 3, size: "large" }
];

期望的输出:

[
  [1, { size: "small" }, { size: "medium" }, { size: "large" }],
  [2, { size: "medium" }],
  [3, { size: "large" }]
];

如何在.map中为每个TableRow添加链接？

*我的错误是validateDOMNesting（...）：使用react router react-router-dom无法显示为“ <a>” im的子级

如何在Table TableRow的.map的每个循环中添加链接？

   import React, { Fragment } from 'react'
import { Paper } from 'material-ui'
import Table from 'material-ui/Table';
import TableBody from 'material-ui/Table/TableBody';
import TableCell from 'material-ui/Table/TableCell';
import TableHead from 'material-ui/Table/TableHead';
import TableRow from 'material-ui/Table/TableRow';
import { connect } from 'react-redux'
// import { Edit, Delete } from '@material-ui/icons'
import { withStyles } from 'material-ui/styles'
import { BrowserRouter as Router, Route, Link } from "react-router-dom";
const drawerWidth = 100;
class Listofbond extends React.Component { …

我的问题实际上类似于:在JavaScript中从数组中提取最重复的值(使用jQuery)

我找到了这个,但它总是只返回一个值200.

var arr = [100,100,200,200,200,300,300,300,400,400,400];
    var counts = {}, max = 0, res;
    for (var v in arr) {
      counts[arr[v]] = (counts[arr[v]] || 0) + 1;
      if (counts[arr[v]] > max) { 
        max = counts[arr[v]];
        res = arr[v];
      }

    }
    console.log(res + " occurs " + counts[res] + " times");

请帮我回报价值不仅仅是一个......

结果是这样的:200,300,400.请帮助谢谢!