mui 浏览器跨域实现

APP开发时 是不需要JSONP支持的 mui本身就支持 但是 如果是微信或者浏览器的普通模式就不支持。所以贴出以下代码 大家可参考使用。（参考了zepto）

var jsonpID = 0;  
    $.ajaxJSONP = function(url, options){  
        if (typeof url === "object") {  
            options = url;  
            url = undefined;  
        }  
        var options = $.extend({}, options || {})  
        for (var key in $.ajaxSettings) {  
            if (options[key] === undefined) {  
                options[key] = $.ajaxSettings[key];  
            }  
        }  
         options.url = appendQuery(options.url, '_=' + Date.now())  

        options.url = appendQuery(options.url,  
          options.jsonp ? (options.jsonp + '=?') : options.jsonp === false ? '' : 'callback=?')  
        var _callbackName = options.jsonpCallback,  
      callbackName = ($.isFunction(_callbackName) ?  
        _callbackName() : _callbackName) || ('jsonp' + (++jsonpID)),  
      script = document.createElement('script'),  
      originalCallback = window[callbackName],  
      responseData,  
      abort = function(errorType) {  
       script.parentNode.removeChild(script)  
        if (callbackName in window) window[callbackName] = empty  
        ajaxComplete('abort', xhr, options)  
      },  
      xhr = { abort: abort }, abortTimeout;  
        if (options.error) script.onerror = function() {  
          xhr.abort()  
          options.error()  
        }  

        window[callbackName] = function(data){  
          clearTimeout(abortTimeout)  
          script.parentNode.removeChild(script)  
          delete window[callbackName]  
          ajaxSuccess(data, xhr, options)  
        }  

        serializeData(options)  
        script.src = options.url.replace(/=\?/, '=' + callbackName)  
        document.head.appendChild(script)  

        if (options.timeout > 0) abortTimeout = setTimeout(function(){  
            xhr.abort()  
            ajaxComplete('timeout', xhr, options)  
          }, options.timeout)      
        return xhr  
      }