取得第一个匹配元素的属性值。通过这个方法可以方便地从第一个匹配元素中获取一个属性的值。

返回值:Object

参数:

• name (String): 属性名称

返回文档中第一个图像的src属性值。

$("img").attr("src");

HTML 代码:

<img src="test.jpg"/>

结果:

test.jpg

attr( name )

Access a property on the first matched element. This method makes it easy to retrieve a property value from the first matched element.

If the element does not have an attribute with such a name, undefined is returned.

Return value: Object
Parameters:

• name (String): The name of the property to access.

Example:

Returns the src attribute from the first image in the document.

 $("img").attr("src");  

 <img src="test.jpg"/>  

 test.jpg