在所有匹配的元素中，设置一个样式属性的值。

返回值:jQuery

参数:

• key (String): 要设置的样式属性名称
• value (Object): 要设置的样式属性的值

把所有段落的color样式属性值改为红色。

$("p").css("color","red");

HTML 代码:

<p>Test Paragraph.</p>

结果:

<p style="color:red;">Test Paragraph.</p>

示例:

把所有段落的left样式属性值设置为"30px"

$("p").css("left",30);

HTML 代码:

<p>Test Paragraph.</p>

结果:

<p style="left:30px;">Test Paragraph.</p>

Set a single style property to a value, on all matched elements. If a number is provided, it is automatically converted into a pixel value.

Return value: jQuery
Parameters:

• key (String): The name of the property to set.
• value (String|Number): The value to set the property to.

Example:

Changes the color of all paragraphs to red

 $("p").css("color","red");  

 <p>Test Paragraph.</p>  

Result:

 <p style="color:red;">Test Paragraph.</p>  

Example:

Changes the left of all paragraphs to "30px"

 $("p").css("left",30);  

 <p>Test Paragraph.</p>  

 <p style="left:30px;">Test Paragraph.</p>