电商 淘宝评价图片下载

var script = document.createElement('script'); script.src = "https://cdn.bootcdn.net/ajax/libs/jquery/1.12.4/jquery.min.js";
document.head.appendChild(script);




var arr_record = [];

// 图片下载
var download_img = function (img_src, name) {
    var image = new Image();
    image.setAttribute("crossOrigin", "anonymous");
    image.onload = function () {
        var canvas = document.createElement("canvas");
        canvas.width = image.width;
        canvas.height = image.height;
        var context = canvas.getContext("2d");
        context.drawImage(image, 0, 0, image.width, image.height);
        var url = canvas.toDataURL("image/png");
        var a = document.createElement("a");
        var event = new MouseEvent("click");
        a.download = name || "photo";
        a.href = url;
        a.dispatchEvent(event);
    };
    image.src = img_src;
};

// 评价图片-详情
var tianmao_comment_pic_detail = function () {
    console.log('评价图片-开始下载');
    var child = $("#reviews div.J_KgRate_MainReviews").children()[1];
    $(child).find("li.photo-item img").each(function () {
        var url = "https:" + $(this).attr("src").replace("_40x40.jpg", "");
        var index = arr_record.length;
        var name = "img" + index + ".png";
        arr_record.push({
            name: name,
            url: url
        });
    });
    console.log('评价图片-下载完成');
};

// 评价图片-翻页
var tianmao_comment_pic_jump = function (para) {
    // 下载所有图片
    var download_all_pic = function () {
        console.log(arr_record);
        for (var i = 0; i < arr_record.length; i++) {
            var item = arr_record[i];
            download_img(item.url, item.name);
        }
        arr_record = [];
    };

    var num = 1;
    var id = setInterval(function () {
        tianmao_comment_pic_detail();
        // 指定抓取页数
        if ((para.num > 0) && (num >= para.num)) {
            console.log("数据抓取完成，开始下载！");
            window.clearInterval(id)
            download_all_pic();
            return;
        }
        // 一直抓取完
        var lastDom = $("#reviews div.J_KgRate_MainReviews li.pg-next:last");
        if (lastDom.hasClass("pg-disabled")) {
            console.log('数据抓取完成，开始下载！');
            window.clearInterval(id)
            download_all_pic();
            return;
        }
        lastDom.click();// 下一页
        num++;
    }, 2000);
};


// 这里指定下载的页数
tianmao_comment_pic_jump({ num: 2 });