我们先来看下按钮样式：
（推荐教程：CSS教程）
具体代码：
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<button id="btn">打印</button>
//js写法
$("#btn").css({
"font-family": "'微软雅黑','Helvetica Neue',Helvetica,Arial,sans-serif",
"font-size": "13px!important",
"height": "30px",
"line-height": "18px!important",
"padding": "3px 18px",
"display": "inline-block",
"vertical-align": "middle",
"font-weight": "normal",
"border-radius": "2px",
"margin": "0 8px 0 3px",
"border": "1px solid #3383da",
"color": "#ffffff",
"background-color": "#3383da"
});
//css写法
#btn{
font-family: "'微软雅黑','Helvetica Neue',Helvetica,Arial,sans-serif";
font-size: 13px!important;
height: 30px;
line-height: 18px!important;
padding: 3px 18px;
display: inline-block;
vertical-align: middle;
font-weight: normal;
border-radius: 3px;
margin: 0 8px 0 3px;
border: 1px solid #3383da;
color: #ffffff;
background-color: #3383da;
cursor: pointer;
} 
