对象字面量里直接设置键值

ES6以前web var mykey = 'key3'; var obj = { key1: 1, key2: 2 }; obj[mykey] = 3; // obj输出的值为 {key3: 3, key1: 1, key2: 2} ES6语法svg var mykey = 'key3'; var obj = { key1: 1, key2: 2, [myk

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