简单检查display属性(或)visibility取决于您喜欢何种隐形。例如:

if ($('#invisible').css('display') == 'none') {
    // This means the HTML element with ID 'invisible' has its 'display' attribute set to 'none'
}

if($("h1").is(":hidden")){
    // your code..
}

你可以试试这个

$(document).ready(function() {
   var view = $(this).is(':visible');

   if(view) {
      alert("view");
                    // Code
   }
   else
   {
      alert("hidden");
   }
});

if($('#postcode_div').is(':visible')) {
    if($('#postcode_text').val()=='') {
        $('#spanPost').text('\u00a0');
    } else {
        $('#spanPost').text($('#postcode_text').val());
}

content.style.display != 'none'

function toggle() {
  $(content).toggle();
  let visible= content.style.display != 'none'
  console.log('visible:', visible);
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<button onclick="toggle()">Show/hide</button>
<div id="content">ABC</div>

用于检查元素是否可见、未显示或甚至不透明水平的扩展功能

它返回时返回false如果元素不可见。

function checkVisible(e) {
    if (!(e instanceof Element)) throw Error('not an Element');
    const elementStyle = getComputedStyle(e);
    if (elementStyle.display === 'none' || elementStyle.visibility !== 'visible' || elementStyle.opacity < 0.1) return false;
    if (e.offsetWidth + e.offsetHeight + e.getBoundingClientRect().height +
        e.getBoundingClientRect().width === 0) {
        return false;
    }
    const elemCenter   = {
        x: e.getBoundingClientRect().left + e.offsetWidth / 2,
        y: e.getBoundingClientRect().top + e.offsetHeight / 2
    };
    if (elemCenter.x < 0 || elemCenter.y < 0) return false;
    if (elemCenter.x > (document.documentElement.clientWidth || window.innerWidth)) return false;
    if (elemCenter.y > (document.documentElement.clientHeight || window.innerHeight)) return false;
    let pointContainer = document.elementFromPoint(elemCenter.x, elemCenter.y);
    do {
        if (pointContainer === e) return true;
    } while (pointContainer = pointContainer.parentNode);
    return false;
}