大家好，又见面了，我是你们的朋友全栈君。
导出为图片
1.将页面html转换成图片 npm install html2canvas –save
2.在需要导出的页面引入 import html2canvas from ‘html2canvas’;
3.在 methods 中添加方法
dataURLToBlob(dataurl) {//ie 图片转格式
var arr = dataurl.split(‘,’), mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
while (n–) {
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], {type: mime})
},
downloadResult(name) {
let canvasID = document.body
let a = document.createElement(‘a’);
html2canvas(canvasID).then(canvas => {
let dom = document.body.appendChild(canvas);
dom.style.display = “none”;
a.style.display = “none”;
document.body.removeChild(dom);
let blob = this.dataURLToBlob(dom.toDataURL(“image/png”));
a.setAttribute(“href”, URL.createObjectURL(blob));
a.setAttribute(“download”, name + “.png”)
document.body.appendChild(a);
a.click();
URL.revokeObjectURL(blob);
document.body.removeChild(a);
});
},
printOut(name) {
// 个人观察只是截取可见范围以及以下的区域，所以先将滚动条置顶
$(window).scrollTop(0); // jQuery 的方法
document.body.scrollTop = 0; // IE的
document.documentElement.scrollTop = 0; // 其他
this.downloadResult(name)
},
导出为PDF
1.将页面html转换成图片 npm install html2canvas –save
2.将图片生成pdf npm install jspdf –save
3.在需要导出的页面引入 import html2canvas from ‘html2canvas’; import JsPDF from ‘jspdf’
4.在 methods 中添加方法
printOut(name) {
let shareContent = document.body,//需要截图的包裹的(原生的)DOM 对象
width = shareContent.clientWidth, //获取dom 宽度
height = shareContent.clientHeight, //获取dom 高度
canvas = document.createElement(“canvas”), //创建一个canvas节点
scale = 2; //定义任意放大倍数 支持小数
canvas.width = width * scale; //定义canvas 宽度 * 缩放
canvas.height = height * scale; //定义canvas高度 *缩放
canvas.style.width = shareContent.clientWidth * scale + “px”;
canvas.style.height = shareContent.clientHeight * scale + “px”;
canvas.getContext(“2d”).scale(scale, scale); //获取context,设置scale
let opts = {
scale: scale, // 添加的scale 参数
canvas: canvas, //自定义 canvas
logging: false, //日志开关，便于查看html2canvas的内部执行流程
width: width, //dom 原始宽度
height: height,
useCORS: true, // 【重要】开启跨域配置
};
html2Canvas(shareContent, opts).then(() => {
var contentWidth = canvas.width;
var contentHeight = canvas.height;
//一页pdf显示html页面生成的canvas高度;
var pageHeight = (contentWidth / 592.28) * 841.89;
//未生成pdf的html页面高度
var leftHeight = contentHeight;
//页面偏移
var position = 0;
//a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
var imgWidth = 595.28;
var imgHeight = (592.28 / contentWidth) * contentHeight;
var pageData = canvas.toDataURL(“image/jpeg”, 1.0);
var PDF = new JsPDF(“”, “pt”, “a4”);
if (leftHeight < pageHeight) {
PDF.addImage(pageData, “JPEG”, 0, 0, imgWidth, imgHeight);
} else {
while (leftHeight > 0) {
PDF.addImage(pageData, “JPEG”, 0, position, imgWidth, imgHeight);
leftHeight -= pageHeight;
position -= 841.89;
if (leftHeight > 0) {
PDF.addPage();
}
}
}
PDF.save(name + “.pdf”); // 这里是导出的文件名
});
},
发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/141618.html原文链接：https://javaforall.net
