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<div class="first">获取颜色</div>
<p></p> <br>
<div class="second">获取文字尺寸</div>
<p></p> <br>
<div class="third">获取宽高尺寸</div>
<p></p> <br>

<div class="fourth">设置颜色设置文字尺寸</div>
<div class="fifth">设置颜色设置文字尺寸</div>
<div class="sixth">通过回调设置新的值</div>
<div class="seventh">同时设置多少个样式</div>


                div {
  width: 60px;
  height: 60px;
  margin: 5px;
  float: left;
  font-size: 0.8em;
  background: #40e0d0;
.first {
  background-color: lightSkyBlue;
.second {
  background-color: #ccc;
  color: red;
  font-size: 1.2em;
.third {
  background-color: yellow;
.sixth {
  font-size: 12px;



                //background-color:blue; => rgb(0, 0, 255)
//字体大小都会转化成统px大小 em=>px
//{width: "60px", height: "60px"}
var value = $(".first").css(["width", "height"]);
$("p:eq(2)").text("widht:" + value.width + " height:" + value.height);
$(".fourth").css("background-color", "red");
$(".fifth").css("backgroundColor", "blue");
$(".fourth").css("font-size", "12px");
$(".fifth").css("fontSize", "12px");

$(".sixth").css("width", function(index, value) {
  value = value.split("px");
  return Number(value[0]) + 50 + value[1];
  "font-size": "15px",
  "background-color": "#40E0D0",
  border: "10px solid red"