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:'c',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' // } // }

 

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