获取全局自定义属性
(function(){
var iframe = document.createElement("iframe");
document.body.appendChild(iframe);
var originWindow=iframe.contentWindow,
currentWindow=window
var origin =Object.keys(originWindow),
current =Object.keys(currentWindow),
extendAttr={};
current.forEach((key)=>{
if(originWindow[key]===undefined){
extendAttr[key]=currentWindow[key]
};
})
console.log(`origin window:${origin.length},current window:${current.length},extentAttr:${Object.keys(extendAttr).length}`)
console.log("extendAttr:",extendAttr);
document.body.removeChild(iframe);
})();