简单的原生js实现打字机效果。就几行代码，直接看下面：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <div id="div1">fd</div> <script type="text/javascript"> var txt,timer, str = '凌晨四点的洛杉矶', pos = 0, maxLen = str.length + 1, div = document.getElementById('div1'); function write(){ if(pos < maxLen){ txt = str.substring(0,pos); div.innerHTML = txt; pos++; timer = setTimeout(function(){ write(); },200); } } write(); </script> </body> </html>