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

<!DOCTYPE html>

<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！！！

巴特西

html2canvas截取页面

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