5.3 JavaScript 加载 iframe

类似 5.2；
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <script>
        window.onload = function () {
            for (var a = 0; a < document.links.length; a++) {
                document.links[a].onclick = function () {
                    document.getElementById("myTargetId").contentWindow.document.location.href = this.href;
                    return false;
                };
            }
        }
    </script>
</head>
<body>
<a href="index.html">点击</a>
<iframe id="myTargetId"></iframe>
</body>
</html>