我们知道JSON.parse能将JSON字符串转变成JS对象，但在一些转换中可能出现Unexpected token ' in JSON at position 1的错误，这是因为被转换的值不符合JSON格式而造成的。
JSON官方明确规定，JSON数据的key与value必须使用双引号""包裹，否则在转换过程中会导致错误。
A value can be a string in double quotes, or a number, or true or false or null, or an object or an array. These structures can be nested.
A string is a sequence of zero or more Unicode characters, wrapped in double quotes, using backslash escapes. A character is represented as a single character string. A string is very much like a C or Java string.
示例 // 数组 let a = '["a","b","c"]';// √
let b = "['a','b','c']";// X
// 对象 let a1 = '{"name":"听风是风","age":"26"}';// √
let b1 = "{'name':'听风是风','age':'26'}";// X
console.log(JSON.parse(a))// Array
console.log(JSON.parse(a1))// Object
console.log(JSON.parse(b))// 报错
console.log(JSON.parse(b1))// 报错
