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JS learning notes 06-08: traversal of arrays and four methods of arrays

2022-07-19 08:30:00 【The man fished alone in the cold river snow】 

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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // var arr=[" The Monkey King "," Pig eight quit "," The sand monk "," Tang's monk "];

        // for (var i=0;i<arr.length;i++){
    
        //     console.log(arr[i]);
        // }

        function Person(name,age){
    
                console.log(" name :"+this.name,+this.age)
        }
        var per=new Person(" The Monkey King ",18);
        var per2=new Person(" Red boy ",16);
        var per3=new Person(" Erlang God ",38);
        var per4=new Person(" Jade Emperor ",18);
        var per5=new Person(" Buddha of Tathagata ",28);

        // Will these person Object into an array 
        var perArr=[per,per2,per3,per4,per5];
        function getAdult(arr){
    
            // Create a new array 
            var newArr=[];
             // Traverse arr, obtain arr Medium Person object 
             for (var i=0;i<perArr.length;i++){
    
                console.log(perArr[i]);
             }
             // Judge Person Object's age Greater than or equal to 18 if (perArr[i]>=18){
    
                    newArr.push(perArr[i]);
                    console.log(newArr);
             }else{
    
                console.log[perArr[i]];
             }
             // If greater than or equal to 18, Add this object to newArr in 
             // Return the new array to 
             return newArr;
        }
        var result=getAdult(perArr);
        console.log(result)
       



    </script>
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</body>
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // Create an array 
        var arr=[" The Monkey King "," Pig eight quit "," The sand monk "];
        /* push() -  This method can add one or more elements to the end of the array , And returns the new length of the array  -  You can pass the element to be added as an argument to the method ,  In this way, the element will be automatically added to the end of the array  */                                      
                                                                                                                            
        var result=arr.push(" Tang's monk "," Sun shangxiang "," Bones jing ");
        console.log(arr);
        console.log("result = "+result);// Return length , The return value is in arr in 
        
        //pop() - This method can delete the last element of the array    And return the deleted element as the return value 
        arr.pop();
        /*unshift() -  Add one or more elements to the beginning of the array , And returns the new array length  */
       arr.unshift(" But the king bull "," Princess Iron Fan ");
       console.log(arr);

       //shift() - You can delete the first element of the array , And return the deleted element as the return value 
       

    </script>
</head>
<body>
    
</body>
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