javascript - 在 substring() 文本后显示 div

Question

var x= $('div.text').text();
var first15=x.substring(0, 55);
$(".text").html(first15);

if ($(".text").html(first15).length == 55) {
  $('.ShowText').show();

}

.text
{
  width:100px;
  height:100px;
  border:1px solid #000;
  overflow: hidden;
  font-size:10px;
  position:relative;
 }

.ShowText
{
  display:none;
  color:red; 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="text">.Why do we use it?
It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, and a search for 'lorem ipsum' will uncover many web sites still in their infancy. Various versions have evolved over the years, sometimes by accident, sometimes on purpose (injected humour and the like).
  

</div>
<div class="ShowText">Show more...</div>

你好， 仅当文本有 55 个字符时才可以 show() class="ShowText"吗？ 但是当我添加“=”时总是显示“ShowText”

感谢您的回答

Answer 1

就用这个

(first15.length == 55)

因为length

$(".text").html(first15).length  

这里的 length 是 jquery 方法，它将返回该元素中的元素数量，即 1。所以 1 不等于 55 。