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JavaScript数组:增删改查、排序等

时间:2016-09-05 18:47:03      阅读:185      评论:0      收藏:0      [点我收藏+]

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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

JavaScript数组:增删改查、排序等

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原文地址:http://www.cnblogs.com/On1Key/p/5843012.html

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