插件--（二维码）
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>演示：使用jquery.qrcode生成二维码</title>
<style type="text/css">
.demo{width:400px; margin:40px auto 0 auto; min-height:250px;}
.demo p{line-height:30px}
#code{margin-top:10px}
</style>
<script type="text/javascript" src="./node_modules/jquery/dist/jquery.min.js"></script>
<script type="text/javascript" src="./node_modules/jquery.qrcode/jquery.qrcode.min.js"></script>
<script type="text/javascript">
$(function(){
var str = "我是用jquery.qrcode.min.js生成的二维码";
$('#code').qrcode(toUtf8(str));
$("#sub_btn").click(function(){
$("#code").empty();
var str = toUtf8($("#mytxt").val());
$("#code").qrcode({
render: "table",
width: 200,
height:200,
text: str
});
});
})
function toUtf8(str) {
var out, i, len, c;
out = "";
len = str.length;
for(i = 0; i < len; i++) {
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
out += str.charAt(i);
} else if (c > 0x07FF) {
out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
} else {
out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
}
}
return out;
}
</script>
</head>
<body>
<div id="main">
<div class="demo">
<p>使用jquery.qrcode生成二维码 请输入内容然后提交生成二维码：</p>
<p><input type="text" class="input" id="mytxt" value=""> <input type="button" id="sub_btn" value="提交"></p>
<div id="code"></div>
</div>
</div>
</body>
</html>
