查询元素是否含有指定的属性
api的应用场景是:查询元素是否含有指定的属性。
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关于ZYC.dom.g的资料:http://zhangyaochun.iteye.com/blog/1439262
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/**hasAttr --- check the element if it has the name attribute**@function**@param {HTMLElement} element**@param {String} name the name that looked for**@return {Boolean}**/ZYC.dom.hasAttr = function(element,name){ element = ZYC.dom.g(element);var attr = element.attributes.getNamedItem(name);return !!(attr && attr.specified);};