数组元素求和求平均值

javascript">		let sum = 0
        let ave = 0
        let a = [2,6,1,7,4]
        for(i = 0 ; i < 5 ; i ++ ) {
            sum += a[i]
        }
        ave = sum / 5
        document.write(sum+'<br>')
        document.write(ave)

数组求最大值和最小值

javascript">		let a = [2,6,1,77,52,25,7,0,77]
        let max = 0
        let min = Number.MAX_VALUE
        for(i = 0; i < a.length ; i ++ ) {
            if(a[i] >= max){
                max = a[i]
            }
            else if(a[i] <= min) {
                min = a[i]
            }
        }
        document.write(max + '<br>' + min)

数组筛选

要求

将数组 [2, 0, 6, 1, 77, 0, 52, 0, 25, 7] 中大于等于 10 的元素选出来，放入新数组

代码

javascript">let a = [2, 0, 6, 1, 77, 0, 52, 0, 25, 7]
        let newArray = []
        for(i = 0;i < a.length ; i ++ ) {
            if(a[i] >= 10 ) {
                newArray.push(a[i])
            }
        }
        document.write(newArray)

数组去0

要求

将数组 [2, 0, 6, 1, 77, 0, 52, 0, 25, 7] 中的 0 去掉后，形成一个不包含 0 的新数组

代码

javascript">let a = [2, 0, 6, 1, 77, 0, 52, 0, 25, 7]
        let newArray = []
        for(i = 0;i < a.length ; i ++ ) {
            if(a[i] != 0 ) {
                newArray.push(a[i])
            }
        }
        document.write(newArray)