ES6知识点整理之函数对象参数默认值及其解构应用示例

(({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 undefinedtest4(); // 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"