messengerjs iframe 跨域传数据

messengerjs

/**
 *     __  ___                                                 
 *    /  |/  /___   _____ _____ ___   ____   ____ _ ___   _____
 *   / /|_/ // _ \ / ___// ___// _ \ / __ \ / __ `// _ \ / ___/
 *  / /  / //  __/(__  )(__  )/  __// / / // /_/ //  __// /    
 * /_/  /_/ \___//____//____/ \___//_/ /_/ \__, / \___//_/     
 *                                        /____/               
 * 
 * @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;


});

用法

parent页面

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 页面

    // 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) {

    });