//例子var a = [ [ 1, 3 ], [ 3, 4, 1 ], [ 1 ] ];//a就按每个元素的长度来排a.sort( function( a, b ) { return a.length - b.length;} );//然后再遍历数组去排里面的数组for( var i = 0, len = a.length; i < len; i++ ) { a[ i ].sort( function( a, b ) { return a - b; } );}