兄弟们，帮忙看个代码是什么意思

函数直接量.<script>
function FormatShow()
{
    this.formatblock = {
            "Heading 1": "h1",
            "Heading 2": "h2",
            "Heading 3": "h3",
            "Heading 4": "h4",
            "Heading 5": "h5",
            "Heading 6": "h6",
            "Normal": "p",
            "Address": "address",
            "Formatted": "pre"
        };
}
//实例化.
var test1 = new FormatShow();
//访问取值.
alert(test1.formatblock["Heading 1"]);
</script>