<script language="javascript" type="text/javascript"> var arr1 = [[30,-1,90],[70,100,-40],[39,29,6],[39,92,9]]; var arr2 = []; //确定新数组有多少行 for(var i=0;i<arr1[0].length;i++){  arr2[i] = []; } //动态添加数据 //遍历原数组 for(var i=0;i<arr1.length;i++){  for(var j=0;j<arr1[i].length;j++){   arr2[j][i] = arr1[i][j];  } } //打印新数组 for(var i=0;i<arr2.length;i++){  for(var j=0;j<arr2[i].length;j++){   document.writeln(arr2[i][j]);  }  document.write("<br />"); } </script>