iframe 自适应高度 跨域

window.navigator.Allframes=null;
window.navigator.Allframes = { 'iframe1': window }; 
//根据页面name属性查找到子页面所在Ifame对象 
window.navigator.getFrameByName=function(oName){ 
    return this.Allframes[oName] 
}; 
//将一个Iframe对象注册到window.navigator.Allframes数组中
window.navigator.registerFrame=function(oName,oElement){ 
    this.Allframes[oName]=oElement 
};
window.navigator.createFrame = function (childPage) {
    var fun = function () { 
        this.objChildPage = childPage;
        this.getFrameByName = function (oName) {
            return window.navigator.getFrameByName(oName)
        };
        this.resizeHeight = function () {
            try {
                var height = this.objChildPage.document.body.scrollHeight;               
                if (this.objChildPage.document.getElementById('iframe1').name && height) { 
                    var curIframe = window.navigator.getFrameByName("iframe1");
                    curIframe.height = height+120;
                    return document.body.scrollHeight+120;
                }
            } catch (ex) {
                //异常处理 
                alert(ex);
            }
        }
    };
    return new fun();
};
//在body.onload中调用  
function AutoResizeHeight(){
    try {
        var control = window.navigator.createFrame(this); 
        control.resizeHeight(); 
    }catch(ex){
        alert(ex);
    }
}

//当iframe onload 的时候
function myAsync() {
    AutoResizeHeight(this);
}