JavaScript变量在if语句的主体中声明，它们的作用域是否局限于该主体？

在“if”语句中声明和赋值的变量是否仅在该“if”块内可见，还是在整个函数内可见？

在以下代码中，我做得对吗？（似乎能工作，但多次声明“var structure”似乎很尴尬）有更简洁的解决方案吗？

function actionPane(state) {
    if(state === "ed") {
        var structure = {
            "element" : "div",
            "attr" : {
                "class" : "actionPane"
            },
            "contains" : [{
                "element" : "a",
                "attr" : {
                    "title" : "edit",
                    "href" : "#",
                    "class" : "edit"
                },
                "contains" : ""
            }, {
                "element" : "a",
                "attr" : {
                    "title" : "delete",
                    "href" : "#",
                    "class" : "delete"
                },
                "contains" : ""
            }]
        }
    } else {
        var structure = {
            "element" : "div",
            "attr" : {
                "class" : "actionPane"
            },
            "contains" : [{
                "element" : "a",
                "attr" : {
                    "title" : "save",
                    "href" : "#",
                    "class" : "save"
                },
                "contains" : ""
            }, {
                "element" : "a",
                "attr" : {
                    "title" : "cancel",
                    "href" : "#",
                    "class" : "cancel"
                },
                "contains" : ""
            }]
        }
    }
    return structure;
}