js modifies the key of the object in the array

1. Effect

 Two, the code

<script>
  const options = [
    { key: 1, msg: "小黑" },
    { key: 2, msg: "小绿" },
    { key: 3, msg: "小白" },
    { key: 4, msg: "小蓝" },
    { key: 5, msg: "小黄" },
  ]
</script>

① map method

<script>
  
//const newOptions = options.map((item) => ({ value: item['key'], label: item['msg'],}));
 const newOptions = options.map((item)=>{
          return {
              value: item['key'],
              label: item['msg'],
      }
  })
  console.log("newOptions", newOptions);  
</script>

② replace method

<script>
  let newOptions1 = 
   JSON.parse(JSON.stringify(options).replace(/msg/g,"label").replace(/key/g, "value"));
  console.log("newOptions1", newOptions1);
</script>

③ reduce method

<script>
    const newOptions2 = options.reduce((acc, cur) => {
        const {key,msg, ...rest} = cur;
        acc.push({value: key,label:msg, ...rest});
        return acc;
    }, []); 

  console.log('newOptions2',newOptions2);   
</script>

④ for loop

<script>
     for(let i = 0; i < options.length; i++){
        options[i].value = options[i].key;
        options[i].label = options[i].msg;
        delete options[i].key;
        delete options[i].msg;
    }
    console.log('options',options);
</script>