js文件下载地址：https://download.csdn.net/download/weixin_38296752/10554485
一.引入qrcode.js文件
<script type="text/javascript" src="imgs/js/qrcode.js"></script>
二.定义用于展示二维码的div 并设置样式
<style type="text/css"> ???#qrcode{ ???position: absolute; ???left: 50%; ???top: 50%; ???/* margin-top:-200px; ???margin-left:-200px; */ ???margin:-200px 0 0 -200px; ???}</style><body> ???<div id="qrcode"></div></body>三.js中生成二维码
? ???window.onload=function(){ ???????var qrcode = new QRCode(document.getElementById("qrcode"), { ???????????width : 400,//设置宽高 ???????????height : 400 ???????}); ???????qrcode.makeCode("二维码内容"); ???} ?四.完整示例
<%@ page language="java" contentType="text/html; charset=utf-8" ???pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>js生成二维码</title></head><script type="text/javascript" src="imgs/js/qrcode.js"></script> <script type="text/javascript"> ????window.onload=function(){ ???????var qrcode = new QRCode(document.getElementById("qrcode"), { ???????????width : 400,//设置宽高 ???????????height : 400 ???????}); ???????qrcode.makeCode("二维码内容"); ???} </script><style type="text/css"> ???#qrcode{ ???position: absolute; ???left: 50%; ???top: 50%; ???/* margin-top:-200px; ???margin-left:-200px; */ ???margin:-200px 0 0 -200px; ???}</style><body> ???<div id="qrcode"></div></body></html>js生成简单二维码
原文地址：https://www.cnblogs.com/xiaoqi2018/p/10623189.html