javascript创建联合数组的小例子

//js中的数组可以以键值对的方式存在
var arr = new Array();
arr["A"] = "boss";
arr["B"] = "Emp";
for (var m in arr) {
    document.write(arr[m] + " ");
}
var person = new Object();
person["name"] = "xiaoli";
person["age"] = "18";
person["salary"] = "1888.9";
for (var p in person) {
    document.write(person[p] + "<br>");
}
//测试使用有age属性呢？
if (typeof person["age"] == "undefined") {
    document.write("no");
}