Placeholder demo占位符演示文档

The placeholder plug-in adds an option placeholder that can be set to make text appear in the editor when it is empty and not focused.占位符插件添加了一个可选的placeholder，它可被设置为当编辑器是空的，没有焦点时，使编辑器里出现文本。 If the source textarea has a placeholder attribute, it will automatically be inherited.如果源textarea文本域具有一个placeholder，它会被自动继承。