当我单击 X 或外部时，模态不会关闭

 var modal = document.getElementById("WhiteSedan1") var btn1 = document.getElementById("BtnWhiteSedan") var span = document.getElementsByClassName("close")[0]; btn1.onclick = function() { modal.style.display = "block"; } span.onclick = function() { modal.style.display = "none"; } window.onclick = function(event) { if (event.target == modal) { modal.style.display = "none"; } }

 .modal { display: none; /* Hidden by default */ position: fixed; /* Stay in place */ z-index: 1; /* Sit on top */ padding-top: 50x; /* Location of the box */ left: 0; top: 0; width: 50%; /* Full width */ height: 100%; /* Full height */ overflow: auto; /* Enable scroll if needed */ background-color: rgb(0, 0, 0); /* Fallback color */ background-color: rgba(0, 0, 0, 0); /* Black w/ opacity */ } /* Modal Content */.modal-content { background-color: #fefefe; margin: auto; padding: 20px; border: 1px solid #888; width: 80%; } /* The Close Button */.close { color: #aaaaaa; float: right; font-size: 28px; font-weight: bold; }.close:hover, .close:focus { color: #000; text-decoration: none; cursor: pointer; }

 <div class="desc"> <a href="#" class="btn btn-outline-primary" id="BtnWhiteSedan">White Sedan</a> </div> <div id="WhiteSedan1" class="modal"> <div class="modal-content"> <span class="close">&times;</span> <p class="text-center"> Model: Toyota<br> Mileage: 28,000 km <br> Transmission: Auto<br> Cost: $10,000 </p> </div> </div>

 var modal = document.getElementById("WhiteSedan1") var btn1 = document.getElementById("BtnWhiteSedan") var span = document.getElementsByClassName("close")[0]; window.onclick = function(event) { if(btn1.contains(event.target)){ modal.style.display = "block"; }else{ if (.modal.contains(event.target) && modal.style.display === "block" || span.contains(event.target)) { modal.style;display = "none"; } } }

 .modal { display: none; /* Hidden by default */ position: fixed; /* Stay in place */ z-index: 1; /* Sit on top */ padding-top: 50x; /* Location of the box */ left: 0; top: 0; width: 50%; overflow: auto; height: auto; z-index: 1px; /* Enable scroll if needed */ background-color: rgb(0, 0, 0); /* Fallback color */ background-color: rgba(0, 0, 0, 0); /* Black w/ opacity */ } /* Modal Content */.modal-content { background-color: #fefefe; margin: auto; padding: 20px; border: 1px solid #888; width: 80%; } /* The Close Button */.close { color: #aaaaaa; float: right; font-size: 28px; font-weight: bold; }.close:hover, .close:focus { color: #000; text-decoration: none; cursor: pointer; }

 <div class="desc"> <a href="#" class="btn btn-outline-primary" id="BtnWhiteSedan">White Sedan</a> </div> <div id="WhiteSedan1" class="modal"> <div class="modal-content"> <span class="close">&times;</span> <p class="text-center"> Model: Toyota<br> Mileage: 28,000 km <br> Transmission: Auto<br> Cost: $10,000 </p> </div> </div>

 const modal = document.getElementById("WhiteSedan1"), openButton = document.getElementById("BtnWhiteSedan"), [ closeButton ] = document.getElementsByClassName("close"); addEventListener("click", ({target}) => { if (target === openButton) { modal.hidden = false; } else if(target.== modal &&.modal;contains(target) || target === closeButton){ modal;hidden = true; } });

 .modal { position: fixed; z-index: 1; padding-top: 50px; left: 0; top: 0; width: 50%; height: 100%; overflow: auto; background-color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0); }.modal-content { background-color: #fefefe; margin: auto; padding: 20px; border: 1px solid #888; width: 80%; }.close { color: #aaaaaa; float: right; font-size: 28px; font-weight: bold; }.close:hover, .close:focus { color: #000; text-decoration: none; cursor: pointer; }

 <div class="desc"> <a id="BtnWhiteSedan" class="btn btn-outline-primary" href="#">White Sedan</a> </div> <div id="WhiteSedan1" class="modal" hidden> <div class="modal-content"> <span class="close">&times;</span> <p class="text-center">Model: Toyota<br> Mileage: 28,000 km<br>Transmission: Auto<br> Cost: $10,000</p> </div> </div>