学习目标：

简单的无限debugger

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学习内容：

eval 本地覆盖的简单测试
测试网址：aHR0cDovL3d3dy5zYy4xMDA4Ni5jbi9zZXJ2aWNlL2xvZ2luLmh0bWw=

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学习产出：

eval:

(function () {
    'use strict';

    window._eval = window.eval

    function myeval(src) {
        if(/debugger/gi.test(src))
        {
            return;
        }
        return window._eval(src)
    }

    Object.defineProperty(window, 'eval', {
        value: myeval
    })
})();
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Function.prototype.constructor:

Function.prototype.constructor_ = Function.prototype.constructor;
Function.prototype.constructor = function(){
	if(arguments[0].indexOf("debu") != -1){
		return
	}
	return Function.prototype.constructor_.apply(this, arguments)
}
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