代码示例：
var findNumberIn2DArray = function(matrix, target) { if(!matrix.length) return false let row = 0 let col = matrix[row].length-1 while(row<matrix.length && col>=0){ if(matrix[row][col] === target){ return true }else if(matrix[row][col] < target){ row++ }else{ col-- } } return false };
![[小玄的刷题日记]《LeetCode零基础指南》(第7讲) 二维数组](https://ucc.alicdn.com/pic/developer-ecology/4b3ca359ab3b464797934842756c3703.png?x-oss-process=image/resize,h_160,m_lfit)