HTML/CSS/JavaScript基础学习day03-作业

        console.log("1. 打印长度大于5的字符串");
        const words = ['apple', 'cat', 'javascript', 'dog', 'elephant', 'hi'];
        for (let i= 0; i< words.length; i++){
            if(words[i].length > 5){
                console.log(words[i]);
            }
        }

        console.log("\n2. 计算大于10的数字的总和");
        const numbers = [5, 15, 3, 25, 8, 30];
        let sum = 0;
        for(let i=0; i< numbers.length; i++){
            if(numbers[i] > 10){
                sum = sum + numbers[i];
            }
        }
        console.log(sum);

        console.log("\n3. 找出数组中最长的字符串");
        const fruits = ['apple', 'banana', 'kiwi', 'strawberry', 'orange'];
        let max = '';
        for(let i=0; i< fruits.length; i++){
            if(fruits[i].length > max.length){
                max = fruits[i];
            }
        }
        console.log(max);

        console.log("\n4. 创建包含偶数索引元素的新数组");
        const colors = ['red', 'green', 'blue', 'yellow', 'purple', 'orange'];
        let newColors = [];
        for(let i=0; i< colors.length; i+=2){
            if( i % 2 === 0){
                newColors.push(colors[i]);
            }
        }
        console.log(newColors);

        console.log("\n5. 统计字符串中元音字母的数量");
        const text = "Hello, welcome to JavaScript world!";
        let count = 0;
        for(let i=0; i< text.length; i++){
            if(text[i] === 'a' || text[i] === 'e' || text[i] === 'i' || text[i] === 'o' || text[i] === 'u'){
                count++;
            }
        }
        console.log(count);

        console.log("\n6. 将长度大于3的字符串转换为大写");
        const animals = ['cat', 'elephant', 'dog', 'giraffe', 'ox'];
        for(let i = 0; i< animals.length; i++){
            if(animals[i].length > 3){
                animals[i] = animals[i].toUpperCase();
            } else {
                continue;

            }
        }
        console.log(animals);

        console.log("\n7. 找出第一个长度大于5的字符串");
        const cities = ['NY', 'London', 'Tokyo', 'San Francisco', 'LA'];
        for(let i=0; i< cities.length; i++){
            if(cities[i].length > 5){
                console.log(cities[i]);
                break;
            }
        }

        console.log("\n8. 创建包含字母'a'的字符串的新数组");
        const foods = ['apple', 'banana', 'cherry', 'date', 'fig'];
        let newFoods = [];
        for(let i=0; i< foods.length; i++){
            if(foods[i].includes('a')){
                newFoods.push(foods[i]);

            }
        }
        console.log(newFoods);

        console.log("\n9. 计算数组中正数的平均值");
        const values = [10, -5, 20, 0, 15, -10, 30];
        let avg = 0;
        let sum1 = 0;
        let count1 = 0;
        for(let i = 0; i< values.length; i++){
            if(values[i] > 0){
                sum1 = sum1 + values[i];
                count1++;
            }
        }
        avg = count1 > 0 ? sum1 / count1 : 0;
        console.log(avg);