不使用jquery实现js打字效果示例分享_javascript技巧

Libraries give you

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;
}