accesskey属性，用于指定激活标签或者使标签获得焦点的快捷键，这可以使键盘用户的导航更加便捷。
HTML5 允许在任何标签上使用这个属性。该属性 （如链接、按钮、表单控件等）十分有用。
举个例子：
<button accesskey="b">Important Button</button>
accesskey属性，并将第一个设置为 "g"（表示 Garfield），第二个设置为 "c"（表示 Chuck Norris）。
id是 "first" 的a标签添加accesskey属性。'
testString: assert($('#first').attr('accesskey'));
- text: '你应该为id是 "second" 的a标签添加accesskey属性。'
testString: assert($('#second').attr('accesskey'));
- text: '你应该将id是 "first" 的a标签的accesskey属性值设置为小写 "g"。'
testString: assert($('#first').attr('accesskey') == 'g');
- text: '你应该将id是 "second" 的a标签的accesskey属性值设置为小写 "c"。'
testString: assert($('#second').attr('accesskey') == 'c');
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