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[Java教程]es6 语法 (对象扩展)

{ //简洁表示法 let o = 1; let k = 2; let es5 = {  o:o,  k:k }; let es6 = {  o,k }; console.log(es5,es6); //1,2;1,2 let es5_method = {  hello:function(){   console.log('hello'); //hello  } }; let es6_method = {  hello(){   console.log('hello'); //hello  } }; console.log(es5_method.hello(),es6_method.hello()); //undefined undefined}{ //属性表达式 let a = 'b'; let es5_obj = {  a:'c',  b:'c' }; let es6_obj = {  [a]:'c' }; console.log(es5_obj,es6_obj) //{a:'a',b:'c'};{b:'c'};}{ //新增api console.log('字符串',Object.is('abc','abc'),'abc'==='abc'); //true true console.log('数组',Object.is([],[]),[]===[]); //false false console.log('拷贝',Object.assign({a:'a'},{b:'b'}));//{a: "a", b: "b"} let test = {k:123,o:456}; for(let [key,value] of Object.entries(test)){  console.log(key,value); // k 123,o 456 }}// {//  //扩展运算符(支持不友好)//  let {a,b,...c} = {a:'test',b:'kill',c:'ddd',d:'ccc'};//  c = {//   c:'ddd',//   d:'ccc'//  }// }