jQuery文字方塊輸入文字放大預覽程式碼

<title>jQuery文字方塊輸入文字放大預覽程式碼</title>

<script src="js/jquery.min.js"></script>

<style type="text/css">
.fill_ipt{
position: relative;
margin: 200px 0 0 500px;
}
.showbig{
display: block;
width: 400px;
height: 40px;
border: 1px solid #404040;
}
input{
display: block;
width: 100%;
height: 100%;
outline: none;
border: none;
text-indent: 20px;
}
.bigtx{
height: 30px;
min-width:10px;
line-height: 30px;
padding: 0px 8px;
border: 1px solid #C9CFDA;
background: #f5f7fc;
box-shadow: 0 0 10px rgba(120,144,156,0.2);
position: absolute;
left: 0;
top: -0px;
font-size: 24px;
color: #1c2b36;
line-height: normal;
/*display: none;*/
opacity: 0;
transition: all 0.2s;
}
.bigtx span{
font-size: 24px;
color: #1c2b36;
}
</style>

jQuery文字方塊輸入文字放大預覽程式碼是一款鍵盤輸入文字到輸入框的時候文字在上部放大顯示效果。