src/js/book/practice8.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        //P193
        var age = 29;
        function sayAge() {
//            alert(this.age);
        }
        //        alert(window.age);
        sayAge();
        window.sayAge();

        //全局变量不能通过delete删除（Configurable为false），在window对象上定义的属性可以
        window.color = "red";
        delete window.age;
        delete window.color;
        //        alert(window.age);//29
        //        alert(window.color);//undefined

        //P197
        var leftPos = (typeof window.screenLeft == "number") ? window.screenLeft : window.screenX;
        var topPos = (typeof window.screenTop == "number") ? window.screenTop : window.screenY;
        console.log(leftPos);
        console.log(topPos);

        //P200

        var wroxWin = window.open("http://www.baidu.com/", "topFrame");
        if (wroxWin == null) {
//            alert("The popup was blocked!");
        }
        //函数与其他数据类型一样，处于平等地位，可以赋值给其他变量，
        //也可以作为参数，传入另一个函数，或者作为别的函数的返回值
        var print = function (i) {
            console.log(i);
        };
        [1, 2, 3].forEach(print);

        //P203
        //超时调用
        //不建议传递字符串
        //        setTimeout("alert('Hello World')", 1000);
        //推荐
        var t = setTimeout(function () {
            alert("Hello World!");
        }, 2000);
        clearTimeout(t);

        //间歇调用
        var i = 1;
        setInterval(function () {
            console.log(i++);
        }, 1000);

        //        confirm("Are you sure?");
        //        prompt("xxx", "input");
        window.print();
        window.find();

        //location对象
        //使用replace(),用户不能后退
        location.replace("http://bing.com");


    </script>
</head>

<!--<body>-->
<frameset rows="160,*">
    <!--<frame src="practice.html" name="topFrame">-->
    <frameset cols="50%,50%">
        <!--<frame src="practice.html" name="leftFrame">-->
        <!--<frame src="practice.html" name="rightFrame">-->
    </frameset>
</frameset>

<!--</body>-->
</html>