65 lines
1.5 KiB
JavaScript
65 lines
1.5 KiB
JavaScript
// 1
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// 创建一个记录学生成绩的对象，提供一个添加成绩的方法，以及一个显示学生平均成绩的方法。
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function createTranscript() {
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this.gradeList = [];
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this.add = (num) => {
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this.gradeList.push(num);
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};
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this.calcAvge = () => {
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const sum = this.gradeList.reduce((sum, grade) => {
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sum += grade;
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return sum;
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}, 0);
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return sum / this.gradeList.length;
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};
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}
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const transcript1 = new createTranscript();
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transcript1.add(120);
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transcript1.add(80);
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console.log(transcript1.calcAvge());
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// 2
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// 将一组单词存储在一个数组中，并按正序和倒序分别显示这些单词
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const list = ["fan", "sheng", "fa", "lan", "xiu", "ping"];
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for (let i = 0; i < list.length; i++) {
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console.log(list[i]);
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}
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console.log("--------------------------")
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for (let i = list.length - 1; i >= 0; i--) {
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console.log(list[i]);
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}
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// 3
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function weekTemps() {
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this.dataStore = [];
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for (let i = 0; i < 12; i++) {
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this.dataStore.push([])
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}
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this.add = add;
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this.average = average;
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}
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function add(month, temp) {
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this.dataStore[month].push(temp);
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}
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function average() {
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var total = 0;
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for (var i = 0; i < this.dataStore.length; ++i) {
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total += this.dataStore[i];
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}
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return total / this.dataStore.length;
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}
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var thisWeek = new weekTemps();
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thisWeek.add(52);
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thisWeek.add(55);
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thisWeek.add(61);
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thisWeek.add(65);
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thisWeek.add(55);
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thisWeek.add(50);
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thisWeek.add(52);
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thisWeek.add(49);
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print(thisWeek.average()); // displays 54.875
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