jsでHTMLをPDFに変換する

svg2canvas: function(targetElem) {
  var svgElem = targetElem.find('svg');
  svgElem.each(function(index, node) {
    var parentNode = node.parentNode;
    //由于现在的IE不支持直接对svg标签node取内容，所以需要在当前标签外面套一层div，通过外层div的innerHTML属性来获取
    var tempNode = document.createElement('div');
    tempNode.appendChild(node);
    var svg = tempNode.innerHTML;
    var canvas = document.createElement('canvas');
    //转换
    canvg(canvas, svg);
    parentNode.appendChild(canvas);
  });
}

glyphicons2canvas: function(targetElem, fontClassName, fontFamilyName) {
  var iconElems = targetElem.find('.' + fontClassName);
  iconElems.each(function(index, inconNode) {
    var fontSize = $(inconNode).css("font-size");
    var iconColor = $(inconNode).css("color");
    var styleContent = $(inconNode).attr('style');
    //去掉"px"
    fontSize = fontSize.replace("px", "");
    var charCode = getCharCodeByGlyphiconsName(iconName);
    var myCanvas = document.createElement('canvas');
    //把canva宽高各增加2是为了显示图标完整
    myCanvas.width = parseInt(fontSize) + 2;
    myCanvas.height = parseInt(fontSize) + 2;
    myCanvas.style = styleContent;
    var ctx = myCanvas.getContext('2d');
    //设置绘图内容的颜色
    ctx.fillStyle = iconColor;
    //设置绘图的字体大小以及font-family的名字
    ctx.font = fontSize + 'px ' + fontFamilyName;
    ctx.fillText(String.fromCharCode(charCode), 1, parseInt(fontSize) + 1);
    $(inconNode).replaceWith(myCanvas);
  });
}
//根据glyphicons/glyphicon图标的类名获取到对应的char code
getCharCodeByGlyphiconsName: function(iconName) {
  switch (iconName) {
  case("glyphicons-resize-full"):
    return "0xE216";
  case ("glyphicons-chevron-left"):
    return "0xE225";
  default:
    return "";
  }
  }

html2canvas($("#myExportArea"), {
  onrendered: function(canvas) {
    var imgData = canvas.toDataURL('image/jpeg');
    var img = new Image();
    img.src = imgData;
    //根据图片的尺寸设置pdf的规格，要在图片加载成功时执行，之所以要*0.225是因为比例问题
    img.onload = function() {
      //此处需要注意，pdf横置和竖置两个属性，需要根据宽高的比例来调整，不然会出现显示不完全的问题
      if (this.width > this.height) {
        var doc = new jsPDF('l', 'mm', [this.width * 0.225, this.height * 0.225]);
      } else {
        var doc = new jsPDF('p', 'mm', [this.width * 0.225, this.height * 0.225]);
      }
      doc.addImage(imgData, 'jpeg', 0, 0, this.width * 0.225, this.height * 0.225);
      //根据下载保存成不同的文件名
      doc.save('report_pdf_' + new Date().getTime() + '.pdf');
    }
  },
  background: "#fff",
  //这里给生成的图片默认背景，不然的话，如果你的html根节点没设置背景的话，会用黑色填充。
  allowTaint: true //避免一些不识别的图片干扰，默认为false，遇到不识别的图片干扰则会停止处理html2canvas
});