html2canvas截取页面

1.下载html2canvas.js

2.引入

3.修改html2canvas支持远程图片处理

function ImageContainer(src, cors) {
        this.src = src;
        this.image = new Image();
        var self = this;
        this.tainted = null;
        this.promise = new Promise(function(resolve, reject) {
            self.image.onload = resolve;
            self.image.onerror = reject;
            if (cors) {
                //self.image.crossOrigin = "anonymous";//1.去掉此处的anonymous代码改为空
                self.image.crossOrigin = "";
            }
            //self.image.src = src;//2.在源src后面添加一个随机数如时间戳+"?"+new Date().getTime();
            self.image.src = src+"?"+new Date().getTime();
            if (self.image.complete === true) {
                resolve(self.image);
            }
        });
    }

4.保存成base64，并处理


<html>
<head lang="en">
    <meta charset="utf-8">
    <meta name="viewport"
          content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0"/>
    <meta name="format-detection" content="telephone=no,email=no,date=no,address=no">
    <title>群二维码名片title>
    <link rel="stylesheet" href="../css/aui.2.0.css">
    <link rel="stylesheet" href="../css/message_style.css">
head>
<body>

<header class="aui-bar aui-bar-nav aui-margin-b-15">
    <a class="aui-pull-left aui-btn" onclick="closeWin();">
        <span class="aui-iconfont aui-icon-left">返回span>
    a>
    <div class="aui-title">群二维码div>
header>

<div id="info_area">div>

<script id="info_tmpl" type="text/html/x-dot-template">
<div class="s_cardbg">
    <div class="s_card" id="qrcode_card">
        <header>
            <img src="{{= it.groupAvatar}}"/>
            <span>{{= it.groupName}}span>
        header>
        <img id="qrcode_img" src="{{= it.qrcode}}" class="s_code"/>
    div>
div>
<div class="s_carbtnbg">
    <div class="s_caranimation">
        <button id="save">保存图片button>
        <button class="s_sarcancel">取消button>
    div>
div>
script>
body>
<script type="text/javascript" src="../script/api.js">script>
<script type="text/javascript"  src="../script/jquery.min.js">script>
<script type="text/javascript" src="../script/config.js">script>
<script type="text/javascript" src="../script/common.js">script>
<script type="text/javascript" src="../script/doT.min.js">script>
<script type="text/javascript" src="../script/html2canvas.js">script>

<script>
    apiready = function () {
        fix_status_bar();
        var groupId = api.pageParam.groupId;
        var groupName = api.pageParam.groupName;
        var groupAvatar = api.pageParam.groupAvatar;
        var qrcode  = BASE_URL_ACTION + '/Common/GetQrCode?dataId='+groupId+'&dataType=2&prefix=add';

        var data = {};
        data.groupId = groupId;
        data.groupName = groupName;
        data.groupAvatar = groupAvatar;
        data.qrcode = qrcode;
        var interText = doT.template($("#info_tmpl").text());
        $("#info_area").html(interText(data));

        $(".s_code").on("touchstart",function(){
            $(".s_carbtnbg").show();
        })
        $(".s_sarcancel").on("click",function(){
            $(".s_carbtnbg").hide()
        })

        $("#save").on("click", function () {
            html2canvas($("#qrcode_card"), {
                height: $("#qrcode_card").outerHeight() + 20,
                onrendered: function (canvas) {
                    var url = canvas.toDataURL("image/png");
                    var base64str = url.substr(22);
                    //以下代码为下载此图片功能
                    //                    $("#qrcode_img").attr('src',url);

                    var trans = api.require('trans');
                    trans.saveImage({
                        base64Str : base64str,
                        album : true,
                        imgPath : "fs://"
                    }, function(ret, err) {
                        if (ret.status) {
                            toast('保存成功');
                            $(".s_carbtnbg").hide();
                        }
                    });



                },useCORS:true});
        });

    }


script>
html>

实现了web截图，效果不错！！！

本文转自TBHacker博客园博客，原文链接：http://www.cnblogs.com/jiqing9006/p/7201289.html，如需转载请自行联系原作者

html2canvas截取页面

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