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Wscats / CV

:see_no_evil:Front End Engineer Curriculum Vitae - 面试宝典和简历生成器
http://wscats.github.io/CV/omi/build/index.html
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day4 #19

Closed Wscats closed 6 years ago

Wscats commented 7 years ago

冒泡排序

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>12冒泡排序</title>
    <script>
        var arr = [20,133,65,68,24,15,66,58,100,10];

        for(var i=0;i<arr.length-1;i++){
            console.log(i,'-------------------');
            for(var j=0;j<arr.length-i-1;j++){

                if(arr[j] > arr[j+1]){
                    var temp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = temp;
                }
                console.log(arr.join());
            }
        }

        console.log(arr);

        // 用数组sort方法实现排序
        var arr = [20,133,65,68,24,15,66,58,100,10];
        arr.sort(function(a,b){
            // console.log(a,b);

            /*if(a>b){
                return 1;
            }else if(a < b){
                return -1;
            }else{
                return 0;
            }*/

            return a-b;
        });

        console.log(arr);
        console.log(arr.reverse());
    </script>
</head>
<body>

</body>
</html>
Wscats commented 7 years ago

输出数组中的最大值和最小值和平均值

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>14输出数组中的最大值和最小值和平均值</title>
    <script>
        /*
            [10,2,8,55,32,18,9,11,30,16,19,20]
            分别计算出以上数组的最大值，最小值和整个数组的平均值，并输出他们的索引
        */

        // 遍历数组
        var arr = [10,2,8,55,32,18,9,11,30,16,19,20];

        // 先假设最大值和最小值
        var maxIdx = 0;
        var minIdx = 0;
        var max = arr[0];
        var min = arr[0];
        var sum = arr[0];
        for(var i=1;i<arr.length;i++){
            // 找出最大值
            // 遍历过程中当前数字大于max，则把当前数字赋值给max
            if(arr[i] > max){
                max = arr[i];
                maxIdx = i;
            }else if(arr[i] < min){
                min = arr[i];
                minIdx = i;
            }

            // 计算所有数值的和
            sum += arr[i];
        }

        var average = sum/arr.length;

        console.log(maxIdx,max);
        console.log(minIdx,min);
        console.log('平均值：',average);

    </script>
</head>
<body>

</body>
</html>
Wscats commented 7 years ago

随机点名

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>03随机点名简单版</title>
    <script>
    window.onload = function(){
        //0 - arr.length-1
        var arr = ['何国荣','黄耀华','司徒健伟','洪斌','黄博霖','肖清琳','杜凡','方洋','顾伟淘','胡子荣','谢孟宁','蒋涛','陈志权','谢霖辉','谢坤裕','梁喜龙','雷燕豪','江启民','胡泽浩'];

        var name = document.getElementById('name');
        var btn = document.getElementById('btnDM');

        btn.onclick = function(){
            // 得到一个随机整数
            var idx = parseInt(Math.random()*arr.length);

            // 把取到的名字写入#name输入框
            name.value = arr[idx];
        }
    }

    </script>
</head>
<body>
    <input type="text" id="name">
    <button id="btnDM">随机点名</button>
</body>
</html>
Wscats commented 7 years ago

数组的复制

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>08数组的复制</title>
    <script>
        var num = 20;
        var res = num;

        num = 100;

        // console.log(num,res);

        // 数据类型
        // 引用数据类型：数组，对象
        var arr = [10,20,30];
        var arr2 = arr;

        arr.push(100);

        console.log(arr2,arr===arr2);//[10,20,30]

        // 复制一个数组
        var arr = ['广州','深圳','北京','上海'];

        var city = [];

        // 遍历arr中的每一项,把每个城市写入city数组
        for(var i=0;i<arr.length;i++){
            city[i] = arr[i];
        }

        console.log(city,arr,arr===city);//false;

        function show(ar){
            // var ar = city

            ar.push('杭州')

        }

        show(city);

        console.log('city:',city);

    </script>
</head>
<body>
</body>
</html>
Wscats commented 7 years ago

创建一个包含50个三位数的随机数组

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>创建一个包含50个三位数的随机数组</title>
    <script>
        var arr = [];

        // for循环添加元素
        // 100-999
        var arr = [];
        for(var i=0;i<50;i++){
            var num = parseInt(Math.random()*(999-100+1))+100;

            arr[i] = num;
            // arr[arr.length] = num;
            //arr.push(num);
        }

        console.log(arr);
    </script>
</head>
<body>

</body>
</html>