不使用jquery实现js打字效果示例分享

h1,h2 {
  font-weight: 300;
  margin: 0.4em 0;
}
h1 { font-size: 3.5em; }
h2 { font-size: 2.5em; font-weight: 700; color: #505050; }
h3 {
  color: #505050;
  font-size: 1.5em;
}
.fw700 {
  font-weight: 700;
}
input {
  font-size: 100%;
  background: #fff;
  border: none;
  color: #000;
  padding: 12px;
  margin: 0 -0.25em 0 0.3em;
  border-top-left-radius: 9px;
  border-bottom-left-radius: 9px;
  box-shadow: 0 0 5px rgba(0,0,0,0.5) inset;
}
#call {
  border-top-right-radius: none;
  border-radius: none;
}
::-webkit-input-placeholder {
   color: #222;
}

:-moz-placeholder { /* Firefox 18- */
   color: #222; 
}

::-moz-placeholder {  /* Firefox 19+ */
   color: #222; 
}

:-ms-input-placeholder { 
   color: #222; 
}

.inline {
  display: inline;
}

.button {
  display: inline-block;
  background: #009966;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  padding: 0.44em 0.89em 0.39em;
  margin: 0 1em 0 0;
  border-top-right-radius: 9px;
  border-bottom-right-radius: 9px;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  margin-left: 0px;
  font-size: 1em;
  box-shadow: none;
  border: 1px solid rgba(0,0,0,0.1);
  border-left: none;
}

.field-wrapper {
  position:relative;
  margin-bottom:20px;
  display: inline-block;
}

label {
  position:absolute;
  bottom:-20px;
  left:6px;
  font-size:16px;
  color:#aaa;
  transition: all 0.1s linear;
  opacity:0;
  font-weight:bold;
  display: block;
}

label.on {
  color: #4481C4;
}

label.show {
  bottom: -30px;
  opacity: 1;
}

body {
  /* the following line fixes a blink in chrome https://code.google.com/p/chromium/issues/detail?id=108025 */
  -webkit-backface-visibility: hidden;
}