在跨域问题上，域仅仅是通过“URL的首部”来识别而不会去尝试判断相同的ip地址对应着两个域或两个域是否在同一个ip上. 参考：https://developer.51cto.com/art/201102/245701.htm
主页面 www.a.test，嵌套页面:www.b.test 本地apache配置多域名
- 1.hosts 绑定 127.0.0.1 www.a.test 127.0.0.1 www.b.test
- 2.apache配置 httpd-vhosts.conf文件配置
<VirtualHost *:80>
DocumentRoot "/Applications/XAMPP/xamppfiles/htdocs/iframetest/a"
ServerName www.a.test
SetEnv RUNTIME_ENVIROMENT DEV
<Directory "/Applications/XAMPP/xamppfiles/htdocs/iframetest/a">
Options Indexes FollowSymLinks
AllowOverride none
Order allow,deny
Allow from all
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.html [L]
</Directory>
</VirtualHost>被嵌套的页面:www.b.test
if( window.postMessage ){
var message = document.documentElement.scrollHeight;
window.parent.postMessage(message,'https://www.a.test')
}接收消息的页面www.a.test
window.onload = function(){
if(window.postMessage){
var reciever = function(e){
document.getElementById("iframea").height = e.data
}
if(window.addEventListener){
window.addEventListener('message',reciever,false);
}else if(window.attachEvent){
window.attachEvent('onmessage',reciever);
}
}
}