Ron*_*ith 1 javascript dictionary spread-syntax
我真的不知道这出了什么问题。我从Banks＆Porcello的O'Reilly的Learning React中看到了这个特定示例的帖子。但是，这些帖子似乎工作正常，但我的示例不起作用。如果我有错字，我看不到。我的缺点在哪里？我不知道为什么我会得到一个空字符串值而不是“ HB Woodlawn”
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title></title>
<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
</head>
<body>
<script type="text/babel">
// Editing one object in an array of objects
let schools = [
{name: 'Yorktown'},
{name: 'Stratford'},
{name: 'Washington & Lee'},
{name: 'Wakefield'}
];
const editName = (oldName, newName, arr) =>
arr.map(item => {
if (item.name === oldName) {
return {
...item,
name
}
}
else {
return item
}
});
let updatedSchools = editName('Stratford', 'HB Woodlawn', schools);
console.log(updatedSchools[1]); // name: ""
console.log(schools[1]); // name: "Stratford"
</script>
</body>
</html>
let schools = [
{name: 'Yorktown'},
{name: 'Stratford'},
{name: 'Washington & Lee'},
{name: 'Wakefield'}
];
const editName = (oldName, newName, arr) =>
arr.map(item => {
if (item.name === oldName) {
return {
...item,
name: newName
}
}
else {
return item
}
});
let updatedSchools = editName('Stratford', 'HB Woodlawn', schools);
console.log(updatedSchools[1]); // name: ""
console.log(schools[1]); // name: "Stratford"
您尚未为名称添加新值，而是将其留空。添加name:newName