Web Uploader在低版本IE下无法显示Flash的一种情况
用户反馈在IE 8下无法正常显示Web Uploader控件,并已安装了Flash插件。调试发现在内部抛出了Runtime Error的错误,关键代码如下:
Runtime.create = function( opts, orders ) { var type, runtime; orders = orders || Runtime.orders; $.each( orders.split( /\s*,\s*/g ), function() { if ( factories[ this ] ) { type = this; return false; } }); type = type || getFirstKey( factories ); if ( !type ) { throw new Error('Runtime Error'); } runtime = new factories[ type ]( opts ); return runtime; };
可以发现是对应的FlashRuntime并未找到。查看源代码发现在注册FlashRuntime时候有一个版本判断,如果没有符合最低版本要求则不注册。查看用户安装的Flash版本确实低于该要求。
FlashRuntime.register = function( name, component ) { component = components[ name ] = Base.inherits( CompBase, $.extend({ // @todo fix this later flashExec: function() { var owner = this.owner, runtime = this.getRuntime(); return runtime.flashExec.apply( owner, arguments ); } }, component ) ); return component; }; if ( getFlashVersion() >= 11.4 ) { Runtime.addRuntime( type, FlashRuntime ); }