// 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);