( a, b )
| 1343 | } |
| 1344 | |
| 1345 | function extend( a, b ) { |
| 1346 | for ( var prop in b ) { |
| 1347 | if ( b[ prop ] === undefined ) { |
| 1348 | delete a[ prop ]; |
| 1349 | |
| 1350 | // Avoid "Member not found" error in IE8 caused by setting window.constructor |
| 1351 | } else if ( prop !== "constructor" || a !== window ) { |
| 1352 | a[ prop ] = b[ prop ]; |
| 1353 | } |
| 1354 | } |
| 1355 | |
| 1356 | return a; |
| 1357 | } |
| 1358 | |
| 1359 | function addEvent( elem, type, fn ) { |
| 1360 | if ( elem.addEventListener ) { |