<script src="http://res.wx.qq.com/open/js/jweixin-1.2.0.js"></script>

wx.config({
    beta: true,// 必须这么写，否则wx.invoke调用形式的jsapi会有问题
    debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。
    appId: '', // 必填，企业微信的corpID
    timestamp: , // 必填，生成签名的时间戳
    nonceStr: '', // 必填，生成签名的随机串
    signature: '',// 必填，签名，见 附录-JS-SDK使用权限签名算法
    jsApiList: [] // 必填，需要使用的JS接口列表，凡是要调用的接口都需要传进来
});

			//前端
			$.ajax("自己的url", {
				dataType: 'json', //服务器返回json格式数据
				type: 'post', //HTTP请求类型
				headers: {
					'Content-Type': 'application/json'
				},
				
				//contentType: "application/json;charset=utf-8",
				success: function(data) {
					
					var sad = JSON.parse(data.d);
					 
					var token = sad.access_token;
 
					sunc(token);
				},
				error: function(xhr, type, errorThrown) {
					//异常处理；
					alert("进错误了");
					
 
				}
			})
 
		//后端 
		 public string test()
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=自己的corpid&corpsecret=自己的corpsecret");
            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";
            //接受返回来的数据
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream stream = response.GetResponseStream();
            StreamReader streamReader = new StreamReader(stream, Encoding.GetEncoding("utf-8"));
            string retString = streamReader.ReadToEnd();
            streamReader.Close();
            stream.Close();
            response.Close();
 
            return retString;
        }

//随机字符串
		function randomString(len) {
			len = len || 32;
			var $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
			var maxPos = $chars.length;
			var pwd = '';
			for (i = 0; i < len; i++) {
				pwd += $chars.charAt(Math.floor(Math.random() * maxPos));
			}
			return pwd;
		}

var timestamp = Date.parse(new Date());

					var timestamp = Date.parse(new Date());
					// noncestr 随机 字符串
					var noncestr = randomString(16);
					var qiname = getSignature(resyltt, noncestr, timestamp);
 
 
//获取签名
			function getSignature(ticket, noncestr, timestamp) {
				var url = window.location.href.split("#")[0];
				var jsapi_ticket = "jsapi_ticket=" + ticket + "&noncestr=" + noncestr + "&timestamp=" + timestamp +
					"&url=" + url;
			
 
				return sha1(jsapi_ticket);
			}
			// 字符串加密成 hex 字符串
			function sha1(s) {
				var data = new Uint8Array(encodeUTF8(s))
				var i, j, t;
				var l = ((data.length + 8) >>> 6 << 4) + 16,
					s = new Uint8Array(l << 2);
				s.set(new Uint8Array(data.buffer)), s = new Uint32Array(s.buffer);
				for (t = new DataView(s.buffer), i = 0; i < l; i++) s[i] = t.getUint32(i << 2);
				s[data.length >> 2] |= 0x80 << (24 - (data.length & 3) * 8);
				s[l - 1] = data.length << 3;
				var w = [],
					f = [
						function() {
							return m[1] & m[2] | ~m[1] & m[3];
						},
						function() {
							return m[1] ^ m[2] ^ m[3];
						},
						function() {
							return m[1] & m[2] | m[1] & m[3] | m[2] & m[3];
						},
						function() {
							return m[1] ^ m[2] ^ m[3];
						}
					],
					rol = function(n, c) {
						return n << c | n >>> (32 - c);
					},
					k = [1518500249, 1859775393, -1894007588, -899497514],
					m = [1732584193, -271733879, null, null, -1009589776];
				m[2] = ~m[0], m[3] = ~m[1];
				for (i = 0; i < s.length; i += 16) {
					var o = m.slice(0);
					for (j = 0; j < 80; j++)
						w[j] = j < 16 ? s[i + j] : rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1),
						t = rol(m[0], 5) + f[j / 20 | 0]() + m[4] + w[j] + k[j / 20 | 0] | 0,
						m[1] = rol(m[1], 30), m.pop(), m.unshift(t);
					for (j = 0; j < 5; j++) m[j] = m[j] + o[j] | 0;
				};
				t = new DataView(new Uint32Array(m).buffer);
				for (var i = 0; i < 5; i++) m[i] = t.getUint32(i << 2);
 
				var hex = Array.prototype.map.call(new Uint8Array(new Uint32Array(m).buffer), function(e) {
					return (e < 16 ? "0" : "") + e.toString(16);
				}).join("");
				return hex;
			}
 
 
			function encodeUTF8(s) {
				var i, r = [],
					c, x;
				for (i = 0; i < s.length; i++)
					if ((c = s.charCodeAt(i)) < 0x80) r.push(c);
					else if (c < 0x800) r.push(0xC0 + (c >> 6 & 0x1F), 0x80 + (c & 0x3F));
				else {
					if ((x = c ^ 0xD800) >> 10 == 0) //对四字节UTF-16转换为Unicode
						c = (x << 10) + (s.charCodeAt(++i) ^ 0xDC00) + 0x10000,
						r.push(0xF0 + (c >> 18 & 0x7), 0x80 + (c >> 12 & 0x3F));
					else r.push(0xE0 + (c >> 12 & 0xF));
					r.push(0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));
				};
				return r;
			}
 

			wx.config({
						beta: true, // 必须这么写，否则wx.invoke调用形式的jsapi会有问题
						debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来，若要查看传入的参数，可以在pc端打开，参数信息会通过log打出，仅在pc端时才会打印。
						appId: 'appId', // 必填，企业微信的corpID
						timestamp: timestamp, // 必填，生成签名的时间戳
						nonceStr: noncestr, // 必填，生成签名的随机串
						signature: qiname, // 必填，签名，见 附录-JS-SDK使用权限签名算法
						jsApiList: ['chooseImage'] // 必填，需要使用的JS接口列表，凡是要调用的接口都需要传进来
					});

//测试API 接口使用
 
	function hreftestce() {
			alert("开始执行");
			wx.chooseImage({
				success: function(res) {
					images.localId = res.localIds;
					alert('已选择 ' + res.localIds.length + ' 张图片');
				}
			});
 
		}