效果图：
image.png
image.png
1.引入jqury
2.引入js插件html2canvas.min.js
下载地址：http://webscripts.softpedia.com/script/Development-Scripts-js/html2canvas-74663.html
<html>
<meta charset="utf-8">
<head>
<script type="text/javascript" src="js/jquery-1.11.1.min.js"></script>
<script type="text/javascript" src="js/html2canvas.min.js"></script>
<style>
body{background: #ccc}
#dw{position: absolute;top: 10px;left:10%;height: 620px;width:1030px;background: #fff; border:1px solid black;padding: 10px}
.close{
position:relative;
left: 10px;
width:0.2em;
height:1em;
background: #333;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-o-transform: rotate(45deg);
-ms-transform: rotate(45deg);
transform: rotate(45deg);
display: inline-block;
}
.close:after{
content: "";
position: absolute;
top: 0;
left: 0;
width:0.2em;
height:1em;
background: #333;
-webkit-transform: rotate(270deg);
-moz-transform: rotate(270deg);
-o-transform: rotate(270deg);
-ms-transform: rotate(270deg);
transform: rotate(270deg);
}
</style>
</head>
<body>
<!-- 要截图的div main 蓝色区域 -->
<div id="main" style="width: 50%; margin-left: 100px;padding: 50px;height: 400px;background: #5a90a0">
<div style="height: 200px;width: 200px;background: #ccc;"></div>
</div>
<div style="height: 30px;width: 168px;border:2px solid black;background: red;text-align: center;" onclick="doScreenShot()">截图</div>
<!-- 生成图片展示的DIV dw-->
<div id="dw" >
<div style="float: right;width: 25px;height: 25px;" title="关闭" onclick="closeok()">
<span class="close"></span>
</div>
</div>
</body>
<script>
$("#dw").hide();
//关闭图片
function closeok(){
$("#dw").hide();
}
//点击截图
function doScreenShot(){
$("#dw").show();
html2canvas($("#main"), {
onrendered: function(canvas) {
canvas.id = "mycanvas";
var mainwh=$("#main").width();
var mainhg=$("#main").height();
var img = convertCanvasToImage(canvas);
console.log(img);
//document.body.appendChild(img);
$("#dw").append(img) //添加到展示图片div区域
img.onload = function() {
img.onload = null;
canvas = convertImageToCanvas(img, 0, 0, 1024, 600); //设置图片大小和位置
img.src = convertCanvasToImage(canvas).src;
$(img).css({
background:"#fff"
});
//调用下载方法
if(browserIsIe()){ //假如是ie浏览器
DownLoadReportIMG(img.src);
}else{
download(img.src)
}
}
}
});
}
//绘制显示图片
function convertCanvasToImage(canvas) {
var image = new Image();
image.src = canvas.toDataURL("image/png"); //获得图片地址
return image;
}
//生成canvas元素，相当于做了一个装相片的框架
function convertImageToCanvas(image, startX, startY, width, height) {
var canvas = document.createElement("canvas");
canvas.width = width;
canvas.height = height;
canvas.getContext("2d").drawImage(image, startX, startY, width, height, 20, 20, 960, 600); //在这调整图片中内容的显示（大小,放大缩小,位置等）
return canvas;
}
function DownLoadReportIMG(imgPathURL) {
//如果隐藏IFRAME不存在，则添加
if (!document.getElementById("IframeReportImg"))
$('<iframe style="display:none;" id="IframeReportImg" name="IframeReportImg" onload="DoSaveAsIMG();" width="0" height="0" src="about:blank"></iframe>').appendTo("body");
if (document.all.IframeReportImg.src != imgPathURL) {
//加载图片
document.all.IframeReportImg.src = imgPathURL;
}
else {
//图片直接另存为
DoSaveAsIMG();
}
}
function DoSaveAsIMG() {
if (document.all.IframeReportImg.src != "about:blank")
window.frames["IframeReportImg"].document.execCommand("SaveAs");
}
// 另存为图片
function download(src) {
var $a = $("<a></a>").attr("href", src).attr("download", "img.png");
$a[0].click();
}
//判断是否为ie浏览器
function browserIsIe() {
if (!!window.ActiveXObject || "ActiveXObject" in window)
return true;
else
return false;
}
</script>
</html>
网友评论