JS 深度拷贝

gistfile1.txt

let existed = [];
function deepcopy(d) {
    let result = Array.isArray(d) ? [] : {};
    const keys = Object.keys(d);
    if(keys && keys.length > 0) {
        keys.forEach( key => {
            result[key] = deepcopy(d[key]);
        })
    } else {
        console.log(d)
        result = d;
    }
    return result;
}

JSPatch

let a = {};
let b = {};
a.b =  b;
b.a = a;
console.log(a);
let aa = deepcopy(a);
console.log(aa);

/*
let a = {a:1, b:{c:2, d:3, e:[4, 5, {f:6}, [7, 8]]}};
let aa = deepcopy(a);
let b = aa['b'];
b['d'] = 10;
let e = b['e'];
e[0] = 100;
e[2]['f'] = 101;
e[3][0] = 102;
console.log(JSON.stringify(aa));
console.log(JSON.stringify(a));
*/

/*
function removeSub(main, sub) {
    let ids = [];
    main.forEach( (item, index) => {
        if(sub.indexOf(item) > -1) {
            ids.push(index);
        }
    })
    
    ids.forEach(id => {
        main.splice(id, 1)
    })

}


let main = [1, 2, 2, 2, 2, 2, 3, 4, 4, 4, 4, 4, 4, 5, 6];
let sub = [2, 4]
removeSub(main, sub);
console.log(main); //1, 3, 5, 6
*/