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上传时间: 2009-01-16
详细说明： Prototype provides a number of “convenience” methods. Most are aliases of other Prototype methods, with the exception of the $ method, which wraps DOM nodes with additional functionality. These utility methods all address scripting needs that are so common that their names were made as concise as can be. Hence the $-based convention. The most commonly used utility method is without doubt $(), which is, for instance, used pervasively within Prototype’s code to let you pass either element IDs or actual DOM element references jus t about anywhere an element argument is possible. It actually goes way beyond a simple wrapper around document.getElementById; check it out to see just how useful it is. ...展开收缩
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