var foo = {a: "alpha", 2: "two"};
foo[a] --> ReferenceError: a is not definedfoo[2] --> "two" foo.a --> "alpha" console.log(foo.2) --> SyntaxError: missing ) after argument listfoo["a"] --> "alpha" foo["2"] --> "two"本文共 270 字，大约阅读时间需要 1 分钟。
var foo = {a: "alpha", 2: "two"};
foo[a] --> ReferenceError: a is not definedfoo[2] --> "two" foo.a --> "alpha" console.log(foo.2) --> SyntaxError: missing ) after argument listfoo["a"] --> "alpha" foo["2"] --> "two"转载于:https://www.cnblogs.com/JaneBlog/p/8033098.html