add a simple jsonp function

增加一个jsonp的方法使用

Author: ZWkang

ajax(over)/jsonp.js

@@ -0,0 +1,98 @@
+
+//function
+var jsonp = function (url, data, method, success, failed) {
+    var url = url || '',
+        data = data || {},
+        method = method || 'callback',
+        success = success || function () { },
+        failed = failed || function () { };
+
+    var prams = function (obj) {
+
+        var keys = Object.keys(obj);
+        var len = keys.length;
+        var str = '';
+        return keys.reduce(function (a, b, c) {
+            str = a + b + '=' + obj[b];
+            if (c == len - 1) {
+                return str;
+            }
+            return str + '&';
+        }, '?')
+    }
+
+    var random = 'jsonp_' + ((Math.random() * 100000) | 0)
+    window[random] = function (json) {
+        try {
+            success(json);
+            window[random] = null;
+            delete window[random]
+        } catch (e) {
+            failed();
+        }
+
+    }
+    url = url + prams[data];
+    if (url.indexOf('?') === -1) { url = url + '?'; }
+    else { url = url + '&'; }
+
+
+    var jsonScript = document.createElement('script');
+    jsonScript.setAttribute('src', url + method + '=' +);
+    document.getElementsByTagName('head')[0].appendChild(jsonScript);
+    jsonScript.onerror = failed;
+}
+
+//Promise
+var JSONP = function (url, data, method, success, failed) {
+    return new Promise((resolve, reject) => {
+        var url = url || '',
+            data = data || {},
+            method = method || 'callback',
+            success = success || function () { },
+            failed = failed || function () { };
+
+        var prams = function (obj) {
+            var keys = Object.keys(obj);
+            var len = keys.length;
+            var str = '';
+            return keys.reduce(function (a, b, c) {
+                str = a + b + '=' + obj[b];
+                if (c == len - 1) {
+                    return str;
+                }
+                return str + '&';
+            }, '?')
+        }
+
+        var random = 'jsonp_' + ((Math.random() * 100000) | 0)
+        window[random] = function (json) {
+            try {
+                success(json);
+
+                window[random] = null;
+                delete window[random];
+                resolve(json);
+            } catch (e) {
+                failed();
+                reject(e);
+            }
+
+        }
+        url = url + prams[data];
+        if (url.indexOf('?') === -1) {
+            url = url + '?';
+        } else {
+            url = url + '&';
+        }
+
+
+        var jsonScript = document.createElement('script');
+        jsonScript.setAttribute('src', url + method + '=' + random);
+        document.getElementsByTagName('head')[0].appendChild(jsonScript);
+        jsonScript.onerror = (e) => {
+            failed();
+            reject(e);
+        };
+    })
+}