实例 jQuery 如何返回文档和窗口元素的当前宽度

x
 
<!DOCTYPE html>
<html>
<head>
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("#span1").text($(window).width());
    $("#span2").text($(document).width());
  });
});
</script>
</head>
<body>
<p>The width of this window is <span id="span1">unknown</span> px.</p>
<p>The width of this document is <span id="span2">unknown</span> px.</p>
<button>Return the width of the window and document elements</button>
</body>
</html>
                    

输出结果