Question

var s = '{"1" : "Sammy", "2" : "Shark", "3" : "Ocean"}';

var obj = JSON.parse(s);

document.getElementById("user").innerHTML =
"Name: " + obj.1 + " " + obj.2 + "<br>" +
"Location: " + obj.3;

控制台出错：

Uncaught SyntaxError: Unexpected number

Answer 1

使用括号表示法访问对象的数字键：

＆＃13;

const obj = { "1": "Sammy" };
console.log(obj["1"]);

＆＃13;

使用其他字符也是如此，例如-：

＆＃13;

const obj = { "test-123": "works only with bracket notation" };
console.log(obj["test-123"]);

＆＃13;

正如gurvinder372所示，标识符不能是数字，您尝试使用数字访问对象的属性，这是错误的。

Answer 2

更正代码

var s = JSON.parse('{"1" : "Sammy", "2" : "Shark", "3" : "Ocean"}');

document.getElementById("user").innerHTML =
"Name: " + s["1"] + " " + s["2"] + "<br>" +
"Location: " + s["3"];

Answer 3

之后你不能拥有数字。（点运算符）你应该尝试使用[]。

var s = '{"1" : "Sammy", "2" : "Shark", "3" : "Ocean"}';

var obj = JSON.parse(s);

document.getElementById("user").innerHTML =
"Name: " + obj[1] + " " + obj[2] + "<br>" +
"Location: " + obj[3];

未捕获的SyntaxError：意外的数字对象

3 个答案: