本文介绍了html2canvas把div保存图片高清图的方法示例,分享给大家,具体如下:
http://www.bootcdn.cn/(可以搜索html2canvans)
1.选择html2canvas版本(这个版本可以放大倍数保证图片清晰)
默认生成的 canvas 图片在 retina 设备上显示很模糊,处理成 2 倍图能解决这个问题:
var w = $("#code").width();var h = $("#code").height();//要将 canvas 的宽高设置成容器宽高的 2 倍var canvas = document.createElement("canvas");canvas.width = w * 2;canvas.height = h * 2;canvas.style.width = w + "px";canvas.style.height = h + "px";var context = canvas.getContext("2d");//然后将画布缩放,将图像放大两倍画到画布上context.scale(2,2);html2canvas(document.querySelector("#code"), { canvas: canvas, onrendered: function(canvas) { ... }});
下载方法:
.on(click,.download,function(){ $(#mycanvas).remove(); var _height=$(.skinReport).height(); //滚到顶部 $(html, body).animate({scrollTop:0}); if(confirm(是否下载肌肤检测报告?)) { setTimeout(function(){ var canvas = document.createElement("canvas"), w=$(#skinReport).width(), h=$(#skinReport).height(); canvas.width = w * 2; canvas.height = h * 2; canvas.style.width = w + "px"; canvas.style.height = h + "px"; var context = canvas.getContext("2d");//然后将画布缩放,将图像放大两倍画到画布上 context.scale(2,2); html2canvas(document.getElementById(skinReport), { allowTaint: false, taintTest: true, canvas: canvas, onrendered: function(canvas) { canvas.id = "mycanvas"; canvas.style.display = none; document.body.appendChild(canvas); //生成base64图片数据 imgData = canvas.toDataURL(type); //var newImg = document.createElement("img"); //newImg.src = dataUrl; //document.body.appendChild(newImg); //console.log(imgData); var _fixType = function(type) { type = type.toLowerCase().replace(/jpg/i, jpeg); var r = type.match(/png|jpeg|bmp|gif/)[0]; return image/ + r; }; // 加工image data,替换mime type imgData = imgData.replace(_fixType(type),image/octet-stream); /** * 在本地进行文件保存 * @param {String} data 要保存到本地的图片数据 * @param {String} filename 文件名 */ var saveFile = function(data, filename){ var save_link = document.createElementNS(http://www.w3.org/1999/xhtml, a); save_link.href = data; save_link.download = filename; var event = document.createEvent(MouseEvents); event.initMouseEvent(click, true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null); save_link.dispatchEvent(event); }; // 下载后的问题名 var filename = aname+肌肤检测报告 + (new Date()).getTime() + . + type; // download saveFile(imgData,filename); }, width:1512, height:15000 }) },2500) } else { return; } })
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。