<script>
var array=[[1,2,3,4,5,6],
[4,5,7,8,9,0,12],
[9,8,7,6,5,4,3,2,1]]
for(i=0;i<array.length;i++)
alert(array[i].length)
</script>array[0]表示[1,2,3,4,5,6]
var array=[[1,2,3,4,5,6],
[4,5,7,8,9,0,12],
[9,8,7,6,5,4,3,2,1]]
for(i=0;i<array.length;i++)
alert(array[i].length)
</script>array[0]表示[1,2,3,4,5,6]
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