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Use javascript to automatically output web page text_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:48:22945browse

Use JavaScript to automatically output web page text. Two functions, setTimeout(), recursion and String.substring(), are used to achieve this function. The implementation code is shared with everyone below.

The effect is like a typist typing.

 <!doctype html>
 <html lang="en">
 <head>
 <meta charset="UTF-8">
 <meta name="Generator" content="EditPlus&reg;">
 <meta name="Author" content="">
 <meta name="Keywords" content="">
 <meta name="Description" content="">
 <title>Document</title>
 </head>
 <body bgcolor="#ccc" onload="printer();">
  <h2 align="center">文本自动输出</h2>
  <br>
  <br>
  <hr width="400" color="black">
  <br>
 <form align="center">
  <textarea cols="50" rows="30" id="text" style="background-color:#FF99CC; color: #330033; cursor: default; font-family: Arial; font-size: 18px" wrap=virtual></textarea>
 </form>
 </body>
 <script type="text/javascript">
 
  //获取textarea对象
  var text=document.getElementById("text");
  //要输出的内容
  var str=" 传统的HTML语言不能开发交互式的动态网页，而JavaScript却能很好的做到这一点。JavaScript是一门相当简单易学的网络化编程语言，通过把她和HTML语言相互结合起来，能够实现实时的动态网页特效，这给网页浏览者在浏览网页的同时也提供了某些乐趣。";
  var pos=0;
  //利用递归和setTimeout()实现文字输出
  function printer(){
   text.value=str.substring(0,pos)+"|";
   //判断是否到达结尾.如果是则一秒后再来一遍.
   if(pos++>str.length){
    pos=0;
    setTimeout("printer()",1000);
   }else{
    setTimeout("printer()",50);
   }
  }
 </script>
 </html>

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