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/**
 * 方法1
 * 调用微信内置浏览器查看图片功能
 * current - 查看图片的 url
 * urls - 查看图片 url 集合
 */
function imagePreview(current, urls) {
    
    // 解析相对路径
    var anchor = document.createElement('a');
    function parseUrl(url) {
        anchor.href = url;
        return anchor.href;
    }

    current = parseUrl(current);
    for (var i = 0; i < urls.length; i++) {
        urls[i] = parseUrl(urls[i]);
    }

    // 调用 WeixinJSBridge imagePreview
    typeof WeixinJSBridge !== 'undefined' && WeixinJSBridge.invoke('imagePreview', {
        current: current,
        urls: urls
    }, function() {});
}


/**
 * 方法2
 * 调用微信内置浏览器查看图片功能
 * <a href="weixin://viewimage/后面你的图片地址">balabala</a>
 * <a href="weixin://viewimage/http://www.baidu.com/img/bdlogo.gif">balabala</a>
 */