找出并打印window非原生扩展属性 windowExtendAttr.js

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找出并打印window非原生扩展属性 windowExtendAttr.js 
window扩展属性，扩展方法，扩展函数，非原生属性，非原生方法，非原生函数

http://owmivsi48.bkt.clouddn.com/windowExtendAttr.js 

// windowExtendAttr.js
(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);
})();