JS generates QR code
This time I will bring you JS to generate QR code. What are the precautions for JS to generate QR code? The following is a practical case, let’s take a look.
HTML code:
<img style="display: none" id="qrcode" data-width="100" data-height="100" data-url="https://www.baidu.com/">
Related JS code:
/**
* 生成二维码
* data-width={宽度}
* data-height={高度}
* data-url={链接}
* @param $ele
*/
var generatorQRCODE = function ($ele) {
$ele.hide();
var params = $ele.data();
if(!params['width'] || !params['height'] || !params['url']){
console.log('生成二维码参数错误');
return false;
}
var image = new Image();
var imageUrl = "http://pan.baidu.com/share/qrcode?w=" + params['width'] + "&h=" + params['height'] + "&url=" + params['url'] + "";
image.src = imageUrl;
$ele.attr('src', imageUrl);
$ele.show();
};
generatorQRCODE($("#qrcode"));Let me share with you other generated 2 QR code case:
Use jquery.qrcode to generate QR code1. First, add the jquery library file and qrcode plug-in to the page<script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="jquery.qrcode.min.js"></script>
<p id="code"></p>
$('#code').qrcode("http://www.baidu.com"); //任意字符串$("#code").qrcode({
render: "table", //table方式
width: 200, //宽度
height:200, //高度
text: "www.helloweba.com" //任意内容
});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;
}var str = toUtf8("字符串测试！");
$('#code').qrcode(str);import QRCode from 'qrcode' //定义生成二维码组件
import QRCode from 'qrcode' //引入生成二维码组件
<template> <p id="query"> <h1>二维码：</h1> <canvas id="canvas"></canvas> </p> </template>
#canvas{
width: 80%!important;
height: auto!important;
}//动态生成二维码
useqrcode(){ //生成的二维码内容，可以添加变量 this.QueryDetail='http://www.kspxzx.com/#/guard'+"?unique_code="+this.QueryDetail;var canvas = document.getElementById('canvas')
QRCode.toCanvas(canvas, this.QueryDetail, function (error) {
if (error) console.error(error)
console.log('success!');
})
}JS implements random switching of WeChat ID
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