js 之函数声明与函数表达式

示例一、
Html 代码
<html >
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title></title>
        <script type="text/javascript">

                var obj = {value:2000};
                var value = 100;
                with(obj){
                    function foo(){//函数声明
                        value *= 2;
                    }
                    foo();
                }
                console.log(value); //200
                console.log(obj.value); //2000


        </script>
    </head>
    <body>
    </body>
</html>
<html >
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title></title>
        <script type="text/javascript">