a=[[a,b,c],[a,d,e][b,c,d]],JS把二维数组内每个数组第一个相等的数组...答:var a=[['a','b','c'],['a','d','e'],['b','c','d']]; var result = []; var getIndex = function(result, arr) { for (var i = 0; i < result.length; i++) { if (result[i] && result[i][0] == arr[0]) { return i; } } ...