从右上角开始
var searchArray = function(array , target) {
if (array.length === 0) return false
let row = 0
let col = array[0].length - 1
while (row < array.length && col >= 0) {
if (array[row][col] > target) col --
else if (array[row][col] < target) row ++
else return true
}
return false
};