messengerjs iframe 跨域传数据

摘要：消息前缀建议使用自己的项目名避免多项目之间的冲突类消息对象往发送消息出于安全考虑发送消息会带上前缀以及现代浏览器支持兼容信使类添加一个消息对象初始化消息监听剥离消息前缀兼容监听消息广播消息用法页面页面跨域传数据跨域传高度

/**
 *     __  ___                                                 
 *    /  |/  /___   _____ _____ ___   ____   ____ _ ___   _____
 *   / /|_/ // _  / ___// ___// _  / __  / __ `// _  / ___/
 *  / /  / //  __/(__  )(__  )/  __// / / // /_/ //  __// /    
 * /_/  /_/ \___//____//____/ \___//_/ /_/ \__, / \___//_/     
 *                                        /____/               
 * 
 * @description MessengerJS, a common cross-document communicate solution.
 * @author biqing kwok
 * @version 2.0
 * @license release under MIT license
 */
define(function (require) {
    // 消息前缀, 建议使用自己的项目名, 避免多项目之间的冲突
    var prefix = "[PROJECT_NAME]",
        supportPostMessage = "postMessage" in window;

    // Target 类, 消息对象
    function Target(target, name){
        var errMsg = "";
        if(arguments.length < 2){
            errMsg = "target error - target and name are both requied";
        } else if (typeof target != "object"){
            errMsg = "target error - target itself must be window object";
        } else if (typeof name != "string"){
            errMsg = "target error - target name must be string type";
        }
        if(errMsg){
            throw new Error(errMsg);
        }
        this.target = target;
        this.name = name;
    }

    // 往 target 发送消息, 出于安全考虑, 发送消息会带上前缀
    if ( supportPostMessage ){
        // IE8+ 以及现代浏览器支持
        Target.prototype.send = function(msg){
            this.target.postMessage(prefix + msg, "*");
        };
    } else {
        // 兼容IE 6/7
        Target.prototype.send = function(msg){
            var targetFunc = window.navigator[prefix + this.name];
            if ( typeof targetFunc == "function" ) {
                targetFunc(prefix + msg, window);
            } else {
                throw new Error("target callback function is not defined");
            }
        };
    }

    // 信使类
    function Messenger(name){
        this.targets = {};
        this.name = name;
        this.listenFunc = [];
        this.initListen();
    }

    // 添加一个消息对象
    Messenger.prototype.addTarget = function(target, name){
        var targetObj = new Target(target, name);
        this.targets[name] = targetObj;
    };

    // 初始化消息监听
    Messenger.prototype.initListen = function(){
        var self = this;
        var generalCallback = function(msg){
            if(typeof msg == "object" && msg.data){
                msg = msg.data;
            }
            // 剥离消息前缀
            msg = msg.slice(prefix.length);
            for(var i = 0; i < self.listenFunc.length; i++){
                self.listenFunc[i](msg);
            }
        };

        if ( supportPostMessage ){
            if ( "addEventListener" in document ) {
                window.addEventListener("message", generalCallback, false);
            } else if ( "attachEvent" in document ) {
                window.attachEvent("onmessage", generalCallback);
            }
        } else {
            // 兼容IE 6/7
            window.navigator[prefix + this.name] = generalCallback;
        }
    };

    // 监听消息
    Messenger.prototype.listen = function(callback){
        this.listenFunc.push(callback);
    };

    // 广播消息
    Messenger.prototype.send = function(msg){
        var targets = this.targets,
            target;
        for(target in targets){
            if(targets.hasOwnProperty(target)){
                targets[target].send(msg);
            }
        }
    };

    return Messenger;


});

var messenger = new Messenger("parent");
        var iframe = document.getElementById("iframepage");
        messenger.addTarget(iframe.contentWindow, "iframe");

        messenger.listen(function (msg) {
            var result = parseInt(msg, 10) + 20;

            if (result < mainWindowHeight) {
                result = mainWindowHeight;
            }
            $("#iframepage").height(result);
});

    // iframe跨域传数据
    var messenger = new Messenger("iframe");
    messenger.addTarget(window.parent, "parent");  

    // 跨域传main 高度
    var height = $(".main").height();
    messenger.targets["parent"].send(height);

    messenger.listen(function (msg) {

    });