SOURCE

console.log("-------------------------练习---------------------------")
var fruits = new Array("apple","orange","mango");
var fruits = ["apple","orange","mango"];
console.log(fruits[1])
fruits.unshift("banana");
console.log(fruits)
fruits.shift();
console.log(fruits)
fruits.push("purple");
console.log(fruits)
fruits.pop();
console.log(fruits)

console.log("--------------------------代码1---------------------------")
function printarray(arr1)
{
    console.log("数组现在的值----");
    for(var i=0;i<arr1.length;i++)
    {
        console.log(arr1[i]);
    }
}
var fruits = ["apple","orange","mango"];
printarray(fruits);
fruits.unshift("banana");
console.log("数组队首增加了banana-----");
printarray(fruits);
fruits.shift("banana");
console.log("数组队首删除了banana----");
printarray(fruits);
fruits.push("purple");
console.log("数组队尾增加了purple----");
printarray(fruits);
fruits.pop("purple");
console.log("数组队尾删除了purple----")
printarray(fruits)

console.log("----------------------------代码2----------------------------")
function printarray(arr1)
{
    console.log("数组现在的值----");
    for(var i=0;i<arr1.length;i++)
    {
        console.log(arr1[i]);
    }
}
var arr2=[50,4,39,9];
console.log("数组foreach----");
arr2.forEach(function(i){
    console.log(i);//打印每一个值
})
console.log("数组map----");
var arr3=arr2.map(function(i){
    return i*i*i;//数组的立方
})
printarray(arr3);//打印新的立方数组
console.log("数组filter----");
var arr4=arr2.filter(function(i){
    return i>35;//只保留35以上的中年人
})
printarray(arr4)