/**
 *
 * @param obj   需要浏览的对象
 * @constructor
 */

//http://qydev.weixin.qq.com/wiki/index.php?title=%E9%A6%96%E9%A1%B5  说明
//http://203.195.235.76/jssdk/  demo
function WxPicView(obj) {
    var aa = [];
    var i = 0;
    var src = [];
    var json = null;
    aa = $(obj);
    for (i = 0; i < aa.length; i++) {
        src[i] = $(obj).eq(i).attr("src");    //把所有的src存到数组里
    }
    $(obj).live("click", function () {
        var index = $(obj).index(this);
        imagePreview($(obj).eq(index).attr("src"), src);
    });
}

function imagePreview(curSrc, srcList) {
    //这个检测是否参数为空
    if (!curSrc || !srcList || srcList.length == 0) {
        return;
    }
    //这个使用了微信浏览器提供的JsAPI 调用微信图片浏览器
    WeixinJSBridge.invoke(‘imagePreview‘, {
        ‘current‘: curSrc,
        ‘urls‘: srcList
    });
}
/**
 *   导航
 * @param lat  经度
 * @param lng  纬度
 * @param name  名称
 * @param address  地址
 * @constructor
 */
function OpenMapLocation(lat, lng, name, address) {
    try {
        lat = parseFloat(lat);
        lng = parseFloat(lng);
        wx.openLocation({
            latitude: lat,
            longitude: lng,
            name: name,
            address: address,
            scale: 14
        });
    } catch (e) {
        window.location.href = " http://apis.map.qq.com/tools/routeplan/eword=" + name + "&epointx=" + lng + "&epointy=" + lat + "&navibutton=2?referer=myapp&key=OB4BZ-D4W3U-B7VVO-4PJWW-6TKDJ-WPB77";
    }
}

/**
 *  两地距离
 * @param lat1
 * @param lng1
 * @param lat2
 * @param lng2
 * @returns {*}
 */
function getFlatternDistance(lat1, lng1, lat2, lng2) {
    lat1 = Number(lat1);
    lat2 = Number(lat2);
    lng1 = Number(lng1);
    lng2 = Number(lng2);
    console.log(lat1 + "==" + lng1 + "==" + lat2 + "==" + lng2);
    var f = getRad((lat1 + lat2) / 2);
    var g = getRad((lat1 - lat2) / 2);
    var l = getRad((lng1 - lng2) / 2);

    var sg = Math.sin(g);
    var sl = Math.sin(l);
    var sf = Math.sin(f);

    var s, c, w, r, d, h1, h2;
    var a = EARTH_RADIUS;
    var fl = 1 / 298.257;

    sg = sg * sg;
    sl = sl * sl;
    sf = sf * sf;

    s = sg * (1 - sl) + (1 - sf) * sl;
    c = (1 - sg) * (1 - sl) + sf * sl;

    w = Math.atan(Math.sqrt(s / c));
    r = Math.sqrt(s * c) / w;
    d = 2 * w * a;
    h1 = (3 * r - 1) / 2 / c;
    h2 = (3 * r + 1) / 2 / s;
    var re = (Math.round(d * (1 + fl * (h1 * sf * (1 - sg) - h2 * (1 - sf) * sg))) / 1000);
    if (isNaN(re)) return "未知距离";
    if (re > 10000) return "未知距离";
    return re.toFixed(2) + " km";
}
function wxInitial(obj, fn) {
    //授权
    obj.url = document.location.href;
    try {
        //Wtxt("正在定位");
        $.ajax({
            url: "/getsign.action",
            type: "post",
            data: obj,
            success: function (data) {
                //$(".windowcenter2").remove();
                wx.config({
                    debug: false,
                    appId: obj.appid,
                    timestamp: 1421142450,
                    nonceStr: ‘Wm3WZYTPz0wzccnW‘,
                    signature: data.sign,
                    jsApiList: [
                        "getLocation", "openLocation", "onMenuShareTimeline", "onMenuShareAppMessage",
                        "onMenuShareQQ", "onMenuShareWeibo", "onMenuShareQZone"
                    ]
                });
            }, error: function () {
                // closeDialog();
                if ($.isFunction(fn)) {
                    fn();
                }
            }

        });

        wx.error(function (res) {
            // closeDialog();
            if ($.isFunction(fn)) {
                fn();
            }
            //  alert(JSON.stringify(res));
            // config信息验证失败会执行error函数，如签名过期导致验证失败，具体错误信息可以打开config的debug模式查看，也可以在返回的res参数中查看，对于SPA可以在这里更新签名。
//istrue =false;
        });
    } catch (e) {
        istrue = true;
    }
    return istrue;
}
/**
 * 定位
 * @param obj   appid: SHOPSET["appid_" + mchid],
                inter: "‘getLocation‘",
                secrect: SHOPSET["secrect_" + mchid]
 * @param fn
 */
function wxGetPosition(obj, fn) {
    try {
        wxInitial(obj, fn);
        wx.ready(function () {
            wx.getLocation({
                type: ‘wgs84‘, // 默认为wgs84的gps坐标，如果要返回直接给openLocation用的火星坐标，可传入‘gcj02‘
                success: function (res) {
                    latitude = res.latitude; // 纬度，浮点数，范围为90 ~ -90
                    longitude = res.longitude; // 经度，浮点数，范围为180 ~ -180。
                    var speed = res.speed; // 速度，以米/每秒计
                    var accuracy = res.accuracy; // 位置精度
                    console.log(latitude + "," + longitude);
                    //  return latitude+","+longitude;
                    if ($.isFunction(fn)) {
                        fn();
                    }
                }
            });
        })

    } catch (e) {
        //  return latitude+","+longitude;
    }
}

/**
 * 分享到朋友圈
 * @param titleInfo
 * @param descInfo
 * @param linkInfo
 * @param imgUrlInfo
 * @param json
 * @param fn
 * @constructor
 */
function SetMenuShareTimeline(titleInfo, descInfo, linkInfo, imgUrlInfo, json, fn) {
    wx.onMenuShareTimeline({
        title: descInfo,
        desc: descInfo,
        link: linkInfo,
        imgUrl: imgUrlInfo,
        trigger: function (res) {

        },
        success: function (res) { //成功分享执行事件
            if ($.isFunction(fn)) {
                fn(json);
            }
        },
        cancel: function (res) {
            alert(‘已取消分享‘);
        },
        fail: function (res) {
            alert(‘分享出错‘);
        }
    });
    SetMenuShareAppMessage(titleInfo, descInfo, linkInfo, imgUrlInfo, json, fn);
}

function SetMenuShareAppMessage(titleInfo, descInfo, linkInfo, imgUrlInfo, json, fn) {
    wx.onMenuShareAppMessage({
        title: titleInfo,
        desc: descInfo,
        link: linkInfo,
        imgUrl: imgUrlInfo,
        trigger: function (res) {
        },
        success: function (res) {
            if ($.isFunction(fn)) {
                fn(json);
            }
        },
        cancel: function (res) {
            alert(‘已取消分享‘);
        },
        fail: function (res) {
            alert(‘分享出错‘);
        }
    });
}

微信公众号开发接口参数调用。