1. 有个代理页面，放在公共的域名下。
2. 调用的页面，引入js。
/*
* Copyright 2010 Nicholas C. Zakas. All rights reserved.
* BSD Licensed.
* modified by wushufeng 2014-07-01
*/
YYPAY.XDStorage = function(origin, path){
this.origin = origin;
this.path = path;
this._iframe = null;
this._iframeReady = false;
this._queue = [];
this._requests = {};
this._id = 0;
}
YYPAY.XDStorage.prototype = {
op:{
WRITE: 'W',
READ: 'R',
DEL: 'D',
CLEAR: 'X'
},
//restore constructor
constructor: YYPAY.XDStorage,
//public interface methods
init: function(){
var that = this;
if (!this._iframe){
if (window.postMessage && window.JSON && window.localStorage){
this._iframe = document.createElement("iframe");
this._iframe.style.cssText = "position:absolute;width:1px;height:1px;left:-9999px;";
document.body.appendChild(this._iframe);
if (window.addEventListener){
this._iframe.addEventListener("load", function(){ that._iframeLoaded(); }, false);
window.addEventListener("message", function(event){ that._handleMessage(event); }, false);
} else if (this._iframe.attachEvent){
this._iframe.attachEvent("onload", function(){ that._iframeLoaded(); }, false);
window.attachEvent("onmessage", function(event){ that._handleMessage(event); });
}
} else {
throw new Error("Unsupported browser.");
}
}
this._iframe.src = this.origin + this.path;
},
getValue: function(key, callback){
this._toSend({
key: key
},callback);
},
setValue: function(key,value,callback){
this._toSend({
key: key,
op: this.op.WRITE,
value: value
},callback);
},
delValue: function(key,callback){
this._toSend({
key: key,
op: this.op.DEL,
value: value
},callback);
},
clearValue: function(callback){
this._toSend({
op: this.op.CLEAR
},callback);
},
//private methods
_toSend: function(params,callback){
var data = {
request: {
key: params.key,
id: ++this._id,
op: params.op,
value: params.value
},
callback: callback
};
if (this._iframeReady){
this._sendRequest(data);
} else {
this._queue.push(data);
}
if (!this._iframe){
this.init();
}
},
_sendRequest: function(data){
this._requests[data.request.id] = data;
this._iframe.contentWindow.postMessage(JSON.stringify(data.request), this.origin);
},
_iframeLoaded: function(){
this._iframeReady = true;
if (this._queue.length){
for (var i=0, len=this._queue.length; i < len; i++){
this._sendRequest(this._queue[i]);
}
this._queue = [];
}
},
_handleMessage: function(event){
if (event.origin == this.origin){
var data = JSON.parse(event.data);
this._requests[data.id].callback && this._requests[data.id].callback(data.key, data.value);
delete this._requests[data.id];
}
}
};
}
3.调用方式
var remoteStorage = new YYPAY.XDStorage("http://auth.xx.com", "/extpub/proxy.html");
remoteStorage.getValue(this.key,function(key,value){
console.log(value);
});