104 lines
2.2 KiB
Markdown
104 lines
2.2 KiB
Markdown
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# js 测试
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## 选择题
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1. 下面声明数组的方式错误的是
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A. var arr=[]
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B. var arr=new Array(7)
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C.var arr=[{name:"asd",age:20"},{name:"asd",age:20"},{name:"asd",age:20"}]
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D.var arr=[{name:"asd",age:20"},{name:"asd",age:20"},0]
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答案 D
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2. 下面哪个不是数组的方法
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A.pop
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B.shift
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C.remove
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D.push
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答案C
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3. 下面哪个遍历数组的方式是错的
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A.
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var arr = [1, 2, 3, 4, 5, 6]
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for(var i = 0; i < arr.length; i++) {
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console.log(arr[i])
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}
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B.
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var arr = ['我', '是', '谁', '我', '在', '哪']
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for(var key in arr) {
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console.log(key)
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}
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C.
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var arr = ['我', '是', '谁', '我', '在', '哪']
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for(var key of arr) {
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console.log(key)
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}
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D.
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var arr = [1, 2, 3, 4, 5, 6]
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var newArr = arr.map(function (item, idnex) {
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return item * item
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})
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console.log(newArr)
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## 填空题
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1. 列举js事件类型（至少五个）
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2. 检测NaN的数据类型结果为
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3. 读代码写执行结果
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```
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function C1(name) {
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if (name) {
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this.name = name;
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}
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}
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function C2(name) {
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this.name = name;
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}
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function C3(name) {
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this.name = name || 'join';
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}
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C1.prototype.name = 'Tom';
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C2.prototype.name = 'Tom';
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C3.prototype.name = 'Tom';
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alert((new C1().name) + (new C2().name) + (new C3().name));
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```
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## 简答题
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1. 写一个函数实现传入一个数组 实现冒泡排序
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2. 数组去重（多种方法实现）
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3. 写一个函数求传入数组的平均数
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4.
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在一个大学的编程选修课班里，我们得到了一组参加该班级的学生数据，分别是姓名、性别、年龄和年级，接下来呢，我们要利用JavaScript的知识挑出其中所有是大一的女生的的名字哦。
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学生信息如下：
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('小A','女',21,'大一'), ('小B','男',23,'大三'),
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('小C','男',24,'大四'), ('小D','女',21,'大一'),
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('小E','女',22,'大四'), ('小F','男',21,'大一'),
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('小G','女',22,'大二'), ('小H','女',20,'大三'),
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('小I','女',20,'大一'), ('小J','男',20,'大三')
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