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javascript链接对象:如何将元素添加到链的末尾?

javascript

Mendes · 技术社区 · 6 年前

考虑下面的链接对象和给定的代码:

let data = {
    item: "0001",
    child: {
        item: "00011",
        child: {
            item: "000111",
            child: {
                item: "0001111",
                child: {
                    item: "00011111",
                    child: null
                }
            }
        }
    }
};

// Add item to last child of data
let last = data.child;
while (last !== null) last = chain.child;

// Add this item as last in chain
last = {
    item: "9999",
    child: null
};

console.log(data); // Same original data. No effect at all!!!

如何在最后一个子对象中添加新项?

4 回复 | 直到 6 年前

Nina Scholz 6 年前

let data = {
    item: "0001",
    child: {
        item: "00011",
        child: {
            item: "000111",
            child: {
                item: "0001111",
                child: {
                    item: "00011111",
                    child: null
                }
            }
        }
    }
};

let last = data;                            // start with data
while (last.child !== null) {               // check the child
    last = last.child;                      // assig child for check of the child's child
}

last.child = { item: "9999", child: null }; // assign new object to a property for
                                            // keeping the reference

console.log(data); // Same original data. No effect at all!!!

.as-console-wrapper { max-height: 100% !important; top: 0; }

Sunny Patel 6 年前

while (last.child !== null) last = last.child;

last.child null last.child = {item: "9999", child: null};

last

Sebastian Speitel 6 年前

last

last = {
    item: "9999",
    child: null
};

.

last.child = {item:"9999",child:null};

enno.void 6 年前

let data = {
    item: "0001",
    child: {
        item: "00011",
        child: {
            item: "000111",
            child: {
                item: "0001111",
                child: {
                    item: "00011111",
                    child: null
                }
            }
        }
    }
};

let run = function(node, addNode){
if(node.child === null){
    node.child = addNode
    return;
}

return run(node.child, addNode)
}

last = {
    item: "9999",
    child: null
};
run(data, last)
console.log(data);

https://jsfiddle.net/q89vt6mn/3/