143 lines
2.6 KiB
JavaScript
143 lines
2.6 KiB
JavaScript
function List() {
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this.listSize = 0;
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this.pos = 0;
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this.dataStore = [];
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this.clear = clear;
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this.find = find;
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this.toString = toString;
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this.insert = insert;
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this.append = append;
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this.remove = remove;
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this.front = front;
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this.end = end;
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this.prev = prev;
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this.next = next;
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this.hasNext = hasNext;
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this.hasPrev = hasPrev;
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this.length = length;
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this.currPos = currPos;
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this.moveTo = moveTo;
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this.getElement = getElement;
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this.contains = contains;
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}
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function append(element) {
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// 元素追加后，listSize 自增
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this.dataStore[this.listSize++] = element;
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}
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function find(element) {
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for (let i = 0; i < this.dataStore.length; i++) {
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if (this.dataStore[i] === element) {
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return i;
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}
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}
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return -1;
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}
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function remove(element) {
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const foundAt = this.find(element);
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if (foundAt > -1) {
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this.dataStore.splice(foundAt, 1);
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--this.listSize;
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return true;
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}
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return false;
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}
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function length() {
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return this.listSize;
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}
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function toString() {
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return this.dataStore;
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}
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function insert(element, after) {
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const insertPos = this.find(after);
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if (insertPos > -1) {
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this.dataStore.splice(after, 0, element);
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++this.listSize;
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return true;
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}
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return false;
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}
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function clear() {
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delete this.dataStore;
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this.dataStore.length = 0;
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this.listSize = this.pos = 0;
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}
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function contains(element) {
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for (let i = 0; i < this.dataStore.length; i++) {
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if (this.dataStore[i] === element) {
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return true
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}
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}
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return false;
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}
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function front() {
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this.pos = 0;
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}
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function end() {
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this.pos = this.listSize - 1;
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}
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function prev() {
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--this.pos;
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}
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function next() {
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if (this.pos < this.listSize) {
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this.pos++;
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}
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}
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function currPos() {
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return this.pos;
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}
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function moveTo(position) {
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this.pos = position;
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}
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function getElement() {
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return this.dataStore[this.pos];
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}
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function hasNext() {
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return this.pos < this.listSize;
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}
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function hasPrev() {
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return this.pos >= 0;
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}
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const names = new List();
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names.append('Clayton');
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names.append('Raymond');
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names.append('Cynthia');
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names.append('Jennifer');
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names.append('Bryan');
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names.append('Danny');
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names.front();
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// console.log(names.getElement());
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names.next();
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// console.log(names.getElement());
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names.next();
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names.next();
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names.prev();
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// console.log(names.getElement());
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// 从前往后遍历
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for (names.front(); names.hasNext(); names.next()) {
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console.log(names.getElement());
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}
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console.log('------------------------------------')
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// 从后往前遍历
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for (names.end(); names.hasPrev(); names.prev()) {
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console.log(names.getElement());
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} |