~~~ /*输出下面代码运行结果*/ //example 1 var a={}, b='123', c=123; a[b]='b'; a[c]='c' ; console.log(a[b]); // "c" // //example 2 var a={}, b=Symbol('123'), c=Symbo1('123'); a[b]='b' ; a[c]='c'; console.log(a[b]); //'b' ~~~  ~~~ //example 3 var a={}, b={key:'123'}, c={key:'456'}; a[b]='b'; a[c]='c' ; console.log(a[b]); //c ~~~