有没有人有一个更复杂的解决方案/库,用JavaScript截断字符串,并在末尾放一个省略号,比明显的一个:

if (string.length > 25) {
  string = string.substring(0, 24) + "...";
}

当前回答

修正Kooilnc的解决方案:

String.prototype.trunc = String.prototype.trunc ||
  function(n){
      return this.length>n ? this.substr(0,n-1)+'…' : this.toString();
  };

如果不需要截断string对象,则返回string值而不是string对象。

其他回答

我总是使用cutr .js库来截断字符串并添加自定义省略号:

new Cuttr('.container', { 此处的选项 截断:“单词”, 长度: 8, 结尾:“...►' }); <script src=“https://unpkg.com/cuttr@1.1.1/dist/cuttr.min.js”></script> <p class=“container”>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.在vero eos et accusam et justo duo dolores et ea rebum.Stet clita kasd gubergren, no sea takimata sanctus est lorem ipsum dolor sit amet.</p>

这是迄今为止我所知道的用JS切割字符串的最简单的方法(并且没有任何依赖关系),它也可以作为jQuery插件使用。

大多数现代Javascript框架(JQuery, Prototype等)都有一个附加在String上的实用函数来处理这个问题。

下面是Prototype中的一个例子:

'Some random text'.truncate(10);
// -> 'Some ra...'

这似乎是您希望其他人处理/维护的功能之一。我会让框架来处理它,而不是编写更多的代码。

在我看来,C_harm的答案是最好的。请注意,如果你想使用

"My string".truncate(n)

您将不得不使用regexp对象构造函数而不是文字。此外,在转换\S时还必须转义它。

String.prototype.truncate =
    function(n){
        var p  = new RegExp("^.{0," + n + "}[\\S]*", 'g');
        var re = this.match(p);
        var l  = re[0].length;
        var re = re[0].replace(/\s$/,'');

        if (l < this.length) return re + '&hellip;';
    };

聪明的地方:D

//My Huge Huge String let tooHugeToHandle = `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).` //Trim Max Length const maxValue = 50 // The barber. const TrimMyString = (string, maxLength, start = 0) => { //Note - `start` is if I want to start after some point of the string if (string.length > maxLength) { let trimmedString = string.substr(start, maxLength) return ( trimmedString.substr( start, Math.min(trimmedString.length, trimmedString.lastIndexOf(' ')) ) + ' ...' ) } return string } console.log(TrimMyString(tooHugeToHandle, maxValue))

人们希望用JavaScript而不是CSS来实现这一点是有充分理由的。

在JavaScript中截断为8个字符(包括省略号):

short = long.replace(/(.{7})..+/, "$1&hellip;");

or

short = long.replace(/(.{7})..+/, "$1…");