var myStringVar = 'myString';
var myFunctionVar = function(){};
console.log('myStringVar' in window);//true
console.log('myFunctionVar' in window);//true

var foo ='bar';
windowRef1 = window;
windowRef2 = this;
console.log(windowRef1,windowRef2);//输出window对象的引用
console.log(windowRef1.foo,windowRef2.foo);//'bar' 'bar' 

//window.alert()和alert()语句基本上是相同的
var foo = {//window对象在这里是隐式的，window.foo
 fooMethod: function(){
  alert('foo' + 'bar');//window对象在这里是隐式的，window.alert
  window.alert('foo' + 'bar');//显式调用window对象，效果一样
 }
}
foo.fooMethod();//window对象在这里是隐式的，window.foo.fooMethod()

undefined NaN Infinity 
Boolean String Number Object Array Function Date RegExp 
Error EvalError RangeError ReferenceError SyntaxError TypeError URIError 

var uri = "http://www.wrox.com/illegal value.htm#start";
console.log(encodeURI(uri));//http://www.wrox.com/illegal%20value.htm#start
console.log(encodeURIComponent(uri));//http%3A%2F%2Fwww.wrox.com%2Fillegal%20value.htm%23start
console.log(escape(uri));//http%3A//www.wrox.com/illegal%20value.htm%23start
var uri = 'http%3A%2F%2Fwww.wrox.com%2Fillegal%20value.htm%23start';
console.log(decodeURI(uri));//http%3A%2F%2Fwww.wrox.com%2Fillegal value.htm%23start
console.log(decodeURIComponent(uri));//http://www.wrox.com/illegal value.htm#start
console.log(unescape(uri));//http://www.wrox.com/illegal value.htm#start