JSON.stringify的多种用法总结

JSON.stringify是一个将JavaScript对象转换为JSON字符串的方法。它的用法有以下几种：

1. 将JavaScript对象转换为JSON字符串，并可以选择性地将某些属性进行过滤：

const obj = { name: 'John', age: 30, city: 'New York' };
const jsonString = JSON.stringify(obj, ['name', 'age']);
console.log(jsonString); // {"name":"John","age":30}

2. 添加额外的空格和缩进，以增加可读性：

const obj = { name: 'John', age: 30, city: 'New York' };
const jsonString = JSON.stringify(obj, null, 2);
console.log(jsonString);
/*
{
"name": "John",
"age": 30,
"city": "New York"
}
*/

3. 对象属性的转换函数：

const obj = { name: 'John', age: 30, city: 'New York' };
const jsonString = JSON.stringify(obj, (key, value) => {
if (typeof value =https://www.yisu.com/ask/=='string') {
return value.toUpperCase();
}
return value;
});
console.log(jsonString); // {"name":"JOHN","age":30,"city":"NEW YORK"}

4. 对象属性的替换：

const obj = { name: 'John', age: 30, city: 'New York' };
const jsonString = JSON.stringify(obj, (key, value) => {
if (key === 'name') {
return 'Jane';
}
return value;
});
console.log(jsonString); // {"name":"Jane","age":30,"city":"New York"}

5. 对象属性排序：

const obj = { name: 'John', age: 30, city: 'New York' };
const jsonString = JSON.stringify(obj, null, 2);
console.log(jsonString);
/*
{
"age": 30,
"city": "New York",
"name": "John"
}
*/

总结：JSON.stringify方法可以根据需求灵活地转换JavaScript对象为JSON字符串，并可以选择性地进行过滤、添加空格和缩进、转换函数、替换属性和排序。