本文介紹了html2canvas把div保存圖片高清圖的方法範例，分享給大家，具體如下：
http://www.bootcdn.cn/（可以搜尋html2canvans）
1.選擇html2canvas版本（這個版本可以放大倍率保證圖片清晰）
預設產生的canvas 圖片在retina 裝置上顯示很模糊，處理成2 倍圖能解決這個問題：
var w = $(#code).width();var h = $(#code).height();//要將canvas 的寬高設定成容器寬高的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);//然後將畫布縮放，將圖像放大兩倍畫到畫布上context.scale(2,2);html2canvas(document.querySelector(#code), { canvas: canvas, onrendered : function(canvas) { ... }});下載方法：
.on('click','.download',function(){ $('#mycanvas').remove(); var _height=$('.skinReport').height(); //滾到頂部$( 'html, body').animate({scrollTop:0}); if(confirm('是否下載肌膚檢測報告？')) { setTimeout(function(){ var canvas = document.createElement(canvas), w=$('#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);//然後將畫布縮放，將圖像放大兩倍畫到畫布上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); //產生base64圖片資料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，取代mime type imgData = imgData.replace(_fixType(type),'image/octet-stream'); /** * 在本地進行檔案保存* @param {String} data 要儲存到本地的圖片資料* @param {String} filename 檔案名*/ 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); }; // 下載後的問題名稱var filename = aname+'肌膚檢測報告' + (new Date()).getTime( ) + '.' + type; // download saveFile(imgData,filename); }, width:1512, height:15000 }) },2500) } else { return; } })以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VeVb武林網。