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javascript getAttribute

var nodes = document.getElementsByTagName("script");var node = nodes[nodes.length - 1];var src = http://www.mamicode.com/document.querySelector ? node.src : node.getAttribute("src", 4);

以前一直以为 node.getAttribute("src", 4) 是笔误,后面在MSDN中找到了对应IE中的API[1],

才明白这种写法是兼容IE的写法。

getAttribute methodRetrieves the value of the specified attribute.Document Object Model (DOM) Level 2 HTML Specification, Section 1.6.5Syntaxobject.getAttribute(strAttributeName, lFlags)ParametersstrAttributeName [in]Type: StringString that specifies the name of the attribute.lFlags [in, optional]Type: IntegerInteger that specifies one or more of the following flags:0Default. Performs a property search that is not case-sensitive, and returns an interpolated value if the property is found.1Performs a case-sensitive property search. To find a match, the uppercase and lowercase letters in strAttributeName must exactly match those in the attribute name.2Returns attribute value as a String. This flag does not work for event properties.4Returns attribute value as a fully expanded URL. Only works for URL attributes.Return valueType: VariantVariant that returns a String, Variant of type Integer, or Boolean value as defined by the attribute. If the attribute is not present, this method returns null.

[1] http://msdn.microsoft.com/en-us/library/ie/ms536429(v=vs.85).aspx