ES6知识点整理之函数对象参数默认值及其解构应

(({x,y})=>{
 console.log(x, y); // // undefined undefined
})({});
(({x=1,y=2})=>{
 console.log(x,y); // 1 2
})({});
(({x=3, y=4}={})=>{
 console.log(x,y); // 3 4
})();

function test4({x,y}={x:100,y:200}) {
 console.log(x,y);
}
test4({}); // undefined undefined
test4(); // 100 200

function test({x=1,y=2,z=3}={}, [a=11,b=22,c=33]=[],name='Joh') {
 console.log(x,y,z,a,b,c,name);
}
test(); // 1 2 3 11 22 33 "Joh"