At.js - 非常实用的脚本用于创建输入自动完成功能 (使用 Emojify 的示例).

$('.atwho-inputor').atwho({    at: "@", data: ["one", "two", "three"],  });

还有一个库叫Typehead来自推ter也实现了同样功能。

特性

• Support IE 7+ for textarea.
• Supports HTML5 contentEditable elements (NOT include IE 8)
• Can listen to any character and not just '@'. Can set up multiple listeners for different characters with different behavior and data
• Listener events can be bound to multiple inputors.
• Format returned data using templates
• Keyboard controls in addition to mouse
  • Tab or Enter keys select the value
  • Up and Down navigate between values (and Ctrl-P and Ctrl-N also)
  • Right and left will re-search the keyword.
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• Custom data handlers and template renderers using a group of configurable callbacks
• Supports AMD
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项目主页：http://www.open-open.com/lib/view/home/1416822141827