var BasicArr = [ [1, 10002, 'lilan', '数学', 68], [2, 10001, 'nilan', '英语', 89], [3, 10002, 'lilan', '英语', 89], [4, 10003, 'lilan', '英语', 89], [5, 10001, 'lilan', '英语', 89]]; var newArr = new Array(); for(var i = 0 ;i<BasicArr.length;i++){ for(var j = i+1 ;j<BasicArr.length;j++){ if(BasicArr[i][1]===BasicArr[j][1]){ BasicArr.splice(j,1); j--; } } }