The input, textarea placeholder and textarea maxlength in IE6-9. Realtime input capture callback function (include context paste, delete, cut)【IE6-9input、textarea placeholder和textarea maxlength的模拟，以及用户实时输入捕捉（包括右键粘贴、删除、剪切、拖文字进输入框）】.
The input, textarea placeholder and textarea maxlength in IE6-9. Realtime input capture callback function (include context paste, delete, cut)【IE6-9input、textarea placeholder和textarea maxlength的模拟，以及用户实时输入捕捉（包括右键粘贴、删除、剪切、拖文字进输入框）】.