JavaScript实现文字逐字显示与光标闪烁效果

<!DOCTYPE html> 
<html> 
<head> 
<meta charset=" utf-8"> 
<title>逐个显示</title> 
<style type="text/css">
#fuck{
  visibility:visible;
}
</style>


<body> 
<div id="content" style="float:left"></div><span id="fuck">|</span>
</body> 
<script type="text/javascript"> 
window.onload=function(){
//首先要干的就是：先把后边的span初始化好
function toggleSpan(){
  var HIDspan=document.getElementById("fuck");
  HIDspan.style.visibility=(HIDspan.style.visibility=="visible")?"hidden":"visible";
}
setInterval(toggleSpan,500);


//开始初始化基础文本
 var ocontent=document.getElementById("content");
 var str="你猜我们会写几个字，不管我写几个字反正不会超过一行就对了";
 var i=0;
 var flag=null;
 
 
 function done(){
  if(i<str.length){
   ocontent.innerHTML=str.substring(0,i+1);
   i=i+1;
  } 
  else{
   clearInterval(flag);
  } 
 }
 flag=setInterval(done,200);
}
</script> 
</html>