这个笔试题没有答案？
以下不可以实现深拷贝数据的有 ？
A、object.assign({}, {a: 1})
B、{...{a:1}}
C、JSON.parse (JSON.stringify({a:1}))
D、[1,2,3].slice()
let test ={a:1};
console.log(test); //{a:1}
let one = Object.assign({}, test);
let two = {...test};
let three = JSON.parse (JSON.stringify(test));
console.log("1:"+one.a); //1
console.log("2:"+two.a); //1
console.log("3:"+three.a); //1
test.a = 2;
console.log(test); //1
console.log("1:"+one.a); //1
console.log("2:"+two.a); //1
console.log("3:"+three.a); //1
let g = [1,2,3];
console.log(g); //[1,2,3]
let four = g.slice();
console.log("4:"+four); //1,2,3
g[0]=4;
console.log(g); //[4,2,3]
console.log("4:"+four); //1,2,3 
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