JQ series: css operation_html/css_WEB-ITnose

JQ中的  .css()有三种使用方法：

1. $('#p').css('width'); Get the width value of the style attribute with ID ｐ; equivalent to return width
2. $('#p').css('width','100px'); Set the style attribute with ID ｐ to width: 100px; (single setting)
3. $('#p').css( {'width':'100px','height':'100px' }); Set the style attribute with ID ｐ to width: 100px; height: 100px; (multiple settings)