Ex的Ajax请求实现同步

Ext2,.x的Ajax实现同步

Ext.lib.Ajax.request = function(method, uri, cb, data, options) {    if(options){        var hs = options.headers;        if(hs){            for(var h in hs){                if(hs.hasOwnProperty(h)){                    this.initHeader(h, hs[h], false);                }            }        }        if(options.xmlData){            if (!hs || !hs['Content-Type']){                this.initHeader('Content-Type', 'text/xml', false);            }            method = (method ? method : (options.method ? options.method : 'POST'));            data = options.xmlData;        }else if(options.jsonData){            if (!hs || !hs['Content-Type']){                this.initHeader('Content-Type', 'application/json', false);            }            method = (method ? method : (options.method ? options.method : 'POST'));            data = typeof options.jsonData == 'object' ? Ext.encode(options.jsonData) : options.jsonData;        }    }   return this["sync" in options ? "syncRequest" : "asyncRequest"](method, uri, cb, data);//这句制定调用的方法，如果sync传递了就调用syncRequest， 否则调用原来的方法asyncRequest};syncRequest方法如下：Ext.lib.Ajax.syncRequest = function(method, uri, callback, postData){    var o = this.getConnectionObject();    if (!o) {        return null;    }    else {        o.conn.open(method, uri, false);         if (this.useDefaultXhrHeader) {            if (!this.defaultHeaders['X-Requested-With']) {                this.initHeader('X-Requested-With', this.defaultXhrHeader, true);            }        }        if(postData && this.useDefaultHeader && (!this.hasHeaders || !this.headers['Content-Type'])){            this.initHeader('Content-Type', this.defaultPostHeader);        }        if (this.hasDefaultHeaders || this.hasHeaders) {            this.setHeader(o);        }        o.conn.send(postData || null);        this.handleTransactionResponse(o, callback);        return o;    }};//调用：Ext.Ajax.request({url:'',scope:this,sync:true,success:function(){}});    

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Ext3.x的Ajax实现同步

<script type="text/javascript" src="../extjs/ext-base.js"></script><script type="text/javascript" src="../extjs/ext-basex.js"></script>//引入另一个JS文件,在附件中。

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