function downloadIamge(selector, name) {
// 通过选择器获取img元素,
var img = document.querySelector(selector)
// 将图片的src属性作为URL地址
var url = img.src
var a = document.createElement('a')
var event = new MouseEvent('click')
a.download = name || '下载图片名称'
a.href = url
a.dispatchEvent(event)
}
<a style="color:blue;" οnclick="downloadIamge('.img1', '信息录入二维码.jpg')">下载二维码</a>
//页面实现简单的下载功能
function OpenQzqdUrl(obj) {
var file = obj.getAttribute("file");
var sxUrl = "";
if (file!=null) {
var url = sxUrl + file;
window.open(url);
}
}
<a href='javascript:void(0);' file='"+mapa.get("file_url")+"' οnclick='OpenQzqdUrl(this)'>"+mapa.get("name")+"</a>