思路1:

• 穷举法

思路2:

function maxValue (arr) {    let min = arr[arr.length-1];     let _maxValue = arr[arr.length - 2] - min;     let diff = 0;    for( let i = arr.length - 3; i>=0; i--){        if ( arr[i+1] < min ) {            min = arr[i+1];        }        diff = arr[i] - min;        if (diff > _maxValue) {            _maxValue = diff;        }    }    return _maxValue;}复制代码