JS数组练习

1.定义一个数组，数组元素是[12,125,34,45,506,44,66,77,88,99]，输出数组中的最大值

var arr = new Array (12,125,34,45,506,44,66,77,88,99);
        let max = arr[0];
        arr.forEach(function(value,index){
             if(value > max){
                 max = value
             }         
        });
        console.log('Max = ',max);

2.定义一个数组，数组元素是[12,125,34,45,506,44,66,77,88,99]，输出所有数组元素之和

/* 定义一个数组，数组元素是[12,125,34,45,506,44,66,77,88,99] ，输出所有数组元素之和 */
        var arr = new Array (12,125,34,45,506,44,66,77,88,99);
        var sum = 0;
        /* for(let i = 0;i< arr.length;i++){
            sum+=arr[i]    
        }
        console.log(sum) */
        for(let i in arr){
            sum +=arr[i]
        }
        console.log(sum)