[6439]

[6438]

[6437]

[6436] $(\":button\") 选取所有 type=\"button\" 的 <input> 元素 和 <button> 元素 $(\"button\")只 获取 <button>

[6435]

[6434]

[6433]

[6432]

[6431]

[6430]

[6429]

[6428]

[6427]

[6426]

[6425]

[6424]

[6423]

[6422]

[6421]

[6420]

[6419]

[6418]