如何讓我的頁腳從頂部覆蓋 100% 的頁面高度和寬度？

Question

我有一個帶有 header、頁腳和內容的 html 頁面。 當用戶點擊我的頁腳時，我希望頁腳從頂部開始覆蓋整個頁面。 當我將頁腳的高度和寬度設置為 100vh 和 100vw 時。 它是從底部開始的。 我如何使它從頂部覆蓋？

Answer 1

您需要使用percentage %而不是vh/vw/px 。 您需要設置top:0; 和height: 100% （設備屏幕的全高）。

 function toggle() { var className = document.getElementById('footer').className; if (className == 'footer') { document.getElementById('footer').innerText = 'Click to minimize'; document.getElementById('footer').className = 'footer full'; } else { document.getElementById('footer').innerText = 'Click to miximize'; document.getElementById('footer').className = 'footer'; } }

 .footer { background-color: #000; color: #FFF; width: 100%; padding: 20px 0; }.full { height: 100%; width: 100%; position: fixed; top: 0px; left: 0px; }

 <h1>My heading</h1> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <p> Hello, this click on the footer to expand it. </p> <br> <div id='footer' class='footer' onClick='toggle()'> Click to maximise </div>

Answer 2

嘗試這個：

$('.footer').click(function(){
        $(this).toggleClass('new_footer');
    });



.new_footer{
    background-color: #000;
    position: fixed;
    top: 0;'
    left: 0;
    right: 0;
    bottom: 0;
    height: 100vh;
    width: 100%;
    color: #fff;
}

<header>
  My heaader
</header>

<div>content</div>

<div class="footer">
 My footer
</div>