使用reduce 和 entries 实现数据类型的转化
将二维数组转化为对象
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<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
</head>
<body>
<script>
let obj = {
a:1,
b:2,
c:3,
d:4
}
// [{text:a ,value:1},{text:b ,value:2},{text:c ,value:3},{text:d ,value:4}]
console.log(Object.entries(obj)) //[[a:1],[b:2]].....
let result = Object.entries(obj).map(item =>{
return {text:item[0],value:item[1]}
})
console.log(result)// [{text:a ,value:1},{text:b ,value:2},{text:c ,value:3},{text:d ,value:4}]
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<script>
let obj = [{text:'a' ,value:1},{text:'b' ,value:2},{text:'c' ,value:3},{text:'d' ,value:4}]
// let obj = {
// a:1,
// b:2,
// c:3,
// d:4
// }
let result = obj.reduce((pre,cur,index)=>{
pre[cur.text] = cur.value
return pre
},{})
console.log(result) //{a: 1, b: 2, c: 3, d: 4}
</script>
</body>
</html>