按时间间隔循环javascript函数

时间:2017-04-02 10:27:49

标签: javascript infinite-loop effect

我是一个用JavaScript创建打字效果的脚本。我试图循环它,以便它在执行结束10秒后在循环中执行。换句话说,存在打字效果,并且当在十秒钟之后写入文本时将再次执行。我尝试过使用setTimeout(),但它没有用。

提前感谢您的帮助。

function setupTypewriter(t) {
  var HTML = t.innerHTML;

  t.innerHTML = "";

  var cursorPosition = 0,
      tag = "",
      writingTag = false,
      tagOpen = false,
      typeSpeed = 50,
      tempTypeSpeed = 0;

  var type = function() {

    if (writingTag === true) {
      tag += HTML[cursorPosition];
    }

    if (HTML[cursorPosition] === "<") {
      tempTypeSpeed = 0;
      if (tagOpen) {
        tagOpen = false;
        writingTag = true;
      } else {
        tag = "";
        tagOpen = true;
        writingTag = true;
        tag += HTML[cursorPosition];
      }
    }
    if (!writingTag && tagOpen) {
      tag.innerHTML += HTML[cursorPosition];
    }
    if (!writingTag && !tagOpen) {
      if (HTML[cursorPosition] === " ") {
        tempTypeSpeed = 0;
      }
      else {
        tempTypeSpeed = (Math.random() * typeSpeed) + 50;
      }
      t.innerHTML += HTML[cursorPosition];
    }
    if (writingTag === true && HTML[cursorPosition] === ">") {
      tempTypeSpeed = (Math.random() * typeSpeed) + 50;
      writingTag = false;
      if (tagOpen) {
        var newSpan = document.createElement("span");
        t.appendChild(newSpan);
        newSpan.innerHTML = tag;
        tag = newSpan.firstChild;
      }
    }

    cursorPosition += 1;
    if (cursorPosition < HTML.length - 1) {
      setTimeout(type, tempTypeSpeed);
    }

  };

  return {
    type: type
  };
}

var typer = document.getElementById('typewriter');

typewriter = setupTypewriter(typewriter);

typewriter.type();

2 个答案:

答案 0 :(得分:1)

typewriter = setupTypewriter(typewriter);

您将typewriter变量传递给setupTypewriter,但它尚不存在。在这里你要使用

typewriter = setupTypewriter(typer);
顺便说一句,我无法理解你如何打印标签。您以零延迟打印<div>,但解析器仍然可能会中断。您应该立即打印标签:<div></div>然后将div的内容附加到它。

答案 1 :(得分:0)

你想要setInterval。

setInterval(function(){alert(&#34; Hello&#34;);},3000);

此代码每三秒运行一次。

此处提供完整的文档,示例等(包括如何阻止它):

https://www.w3schools.com/jsref/met_win_setinterval.asp