( a, b )
| 1292 | } |
| 1293 | |
| 1294 | function extend( a, b ) { |
| 1295 | for ( var prop in b ) { |
| 1296 | if ( b[ prop ] === undefined ) { |
| 1297 | delete a[ prop ]; |
| 1298 | |
| 1299 | // Avoid "Member not found" error in IE8 caused by setting window.constructor |
| 1300 | } else if ( prop !== "constructor" || a !== window ) { |
| 1301 | a[ prop ] = b[ prop ]; |
| 1302 | } |
| 1303 | } |
| 1304 | |
| 1305 | return a; |
| 1306 | } |
| 1307 | |
| 1308 | function addEvent( elem, type, fn ) { |
| 1309 | if ( elem.addEventListener ) { |