JavaScript数组：增删改查排序等

Posted 2020-08-06 On1Key

直接上代码

// 数组应用
    var peoples = ["Jack","Tom","William","Tod","Cart","Jhson"];
    console.log(‘原始：‘+‘length(‘+ peoples.length +‘)==‘ + peoples);
    // push(元素)，从尾部添加
    peoples.push("Smith","Wolf");
    console.log(‘push：‘+‘length(‘+ peoples.length +‘)==‘ + peoples);
    // unshift(元素)，从头部添加
    peoples.unshift("Anderson");
    console.log(‘unshift：‘+‘length(‘+ peoples.length +‘)==‘ + peoples);
    // pop()，从尾部删除
    peoples.pop();
    console.log(‘pop：‘+‘length(‘+ peoples.length +‘)==‘ + peoples);
    // shift()，从头部删除
    peoples.shift();
    console.log(‘shift：‘+‘length(‘+ peoples.length +‘)==‘ + peoples);
    // splice(开始，长度)，删除
    peoples.splice(2,3);
    console.log(‘splice(2,3)：‘+‘length(‘+ peoples.length +‘)==‘ + peoples);
    // splice(开始, 长度,元素…)，先删除，后插入（当长度为0时，相当于插入；当长度等于元素个数时，相当于替换）
    peoples.splice(2,1,"AK-47","91","八一");
    console.log(‘splice(2,1,"AK-47","91","八一")‘+‘length(‘+ peoples.length +‘)==‘ + peoples);
    // concat(数组2)连接两个数组
    peoples.concat(["Mini","Coper"]);
    console.log(‘concat(["Mini","Coper"])：‘+‘length(‘+ peoples.length +‘)==‘ + peoples);
    // join(分隔符)用分隔符，组合数组元素，生成字符串，字符串split
    peoples.join(‘-=0=-‘);
    console.log("join(‘-=0=-‘)："+‘length(‘+ peoples.length +‘)==‘ + peoples);

    // sort([比较函数])，排序一个数组，
    // 注：排序一个字符串数组和数字数组不同
    peoples.sort();
    console.log("sort："+‘length(‘+ peoples.length +‘)==‘ + peoples);
    var numArr = [12,7,1212,11,318,33];
    numArr.sort();
    console.log("sort："+‘length(‘+ numArr.length +‘)==‘ + numArr);
    numArr.sort(function(n1,n2){
        /*
            if(n1 < n2){
                return -1;
            }else if(n1 > n2){
                return 1;
            }else{
                return 0;
            }
        */
　　　　//上面的代码简化如下：

        return n1 - n2;
    });
    console.log("sort(function(...))："+‘length(‘+ numArr.length +‘)==‘ + numArr);

链接：

网易云课堂-关于数组讲解