1. Parameter write-only attribute name, attribute value is returned
$(this).css( ' color '); //300px
2. The parameter is a property name, property values, separated by commas, is set up a set of styles, attributes must be quoted, if the value is a number you can not with the unit and quotes
$ (This) .css ( "color", "red"); // set the current element font color is red
3. The parameters may be in the form of the object, the sets of style easy setup, attribute names and values are separated by a colon, the properties may not be quoted, if the composite name attribute must hump method:
$(this).css({
color : " red "，
width : "300px",
backgroundColor: "pink" // using named composite hump property law
})