用jQuery打字机效果

Question

编辑:我没有真正问过我原来问题中应该提出的所有问题.为了帮助那些寻找类似答案的人们更容易,这就是问题的结果:

如何使用在语句末尾暂停的闪烁光标创建打字机效果,删除语句并写入新语句？

查看Yoshi的答案如下.它正是这样......

Answer 1

演示:http://jsbin.com/araget/5/

插件:

(function ($) {
  // writes the string
  //
  // @param jQuery $target
  // @param String str
  // @param Numeric cursor
  // @param Numeric delay
  // @param Function cb
  // @return void
  function typeString($target, str, cursor, delay, cb) {
    $target.html(function (_, html) {
      return html + str[cursor];
    });

    if (cursor < str.length - 1) {
      setTimeout(function () {
        typeString($target, str, cursor + 1, delay, cb);
      }, delay);
    }
    else {
      cb();
    }
  }

  // clears the string
  //
  // @param jQuery $target
  // @param Numeric delay
  // @param Function cb
  // @return void
  function deleteString($target, delay, cb) {
    var length;

    $target.html(function (_, html) {
      length = html.length;
      return html.substr(0, length - 1);
    });

    if (length > 1) {
      setTimeout(function () {
        deleteString($target, delay, cb);
      }, delay);
    }
    else {
      cb();
    }
  }

  // jQuery hook
  $.fn.extend({
    teletype: function (opts) {
      var settings = $.extend({}, $.teletype.defaults, opts);

      return $(this).each(function () {
        (function loop($tar, idx) {
          // type
          typeString($tar, settings.text[idx], 0, settings.delay, function () {
            // delete
            setTimeout(function () {
              deleteString($tar, settings.delay, function () {
                loop($tar, (idx + 1) % settings.text.length);
              });
            }, settings.pause);
          });

        }($(this), 0));
      });
    }
  });

  // plugin defaults  
  $.extend({
    teletype: {
      defaults: {
        delay: 100,
        pause: 5000,
        text: []
      }
    }
  });
}(jQuery));

HTML:

<span id="target"></span>
<span id="cursor"></span> <!-- used for the blinking cursor effect -->

init:

$('#target').teletype({
  text: [
    'Lorem ipsum dolor sit amet, consetetur sadipscing elitr,',
    'sed diam nonumy eirmod tempor invidunt ut labore et dolore',
    'magna aliquyam erat, sed diam voluptua. At 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. Lorem ipsum dolor sit amet, consetetur sadipscing elitr,',
    'sed diam nonumy eirmod tempor invidunt ut labore et dolore',
    'magna aliquyam erat, sed diam voluptua. At 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.'
  ]
});

$('#cursor').teletype({
  text: ['_', ' '],
  delay: 0,
  pause: 500
});