這次帶給大家js怎麼為輸入框增加動畫效果，js為輸入框增加動畫效果的注意事項有哪些，下面就是實戰案例，一起來看一下。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body >
<p id="header">
<form class="form" >
<input type="text" class="input_key" maxlength="100" autocomplete="on">
</form>
</p>
<script src="js/jquery-1.11.3.min.js"></script>
<script>
(function() {
function p() {
window.requestAnimFrame(p), a = d(0, 360), s.globalCompositeOperation = "destination-out", s.fillStyle = "rgba(0, 0, 0, 0.5)", s.fillRect(0, 0, e, t), s.globalCompositeOperation = "source-over";
var n = u.length;
while (n--) u[n].draw(), u[n].update(n)
}
function d(e, t) {
return Math.random() * (t - e) + e
}
function v() {
i = $('<canvas width="' + e + '" height="' + t + '" />').appendTo(n).css({
position: "absolute",
left: -20,
top: -44,
zIndex: 999,
pointerEvents: "none"
}), s = i[0].getContext("2d"), r = $("<p />").appendTo(n).css({
fontSize: "16px",
fontFamily: "arial",
height: 1,
position: "absolute",
left: 15,
top: 50,
zIndex: 0,
visibility: "hidden",
whiteSpace: "nowrap"
})
}
if (/msie/i.test(navigator.userAgent)) return;
var e = 600,
t = 100,
n = $("#header .form"),
r = null,
i = null,
s = null,
o = !1,
u = [],
a = 120,
f = 8,
l = 0,
c = 0,
h = function(e, t, n) {
var r = this;
r.x = e, r.y = t, r.dir = n, r.coord = {}, r.angle = d(0, -Math.PI), r.speed = d(2, 8), r.friction = .95, r.gravity = 1, r.hue = d(a - 10, a + 10), r.brightness = d(50, 80), r.alpha = 1, r.decay = d(.03, .05), r.init()
};
h.prototype = {
init: function() {
var e = this;
e.coord = {
x: e.x,
y: e.y
}
},
update: function(e) {
var t = this;
t.coord = {
x: t.x,
y: t.y
}, t.speed *= t.friction, t.x += Math.cos(t.angle) * t.speed + t.dir, t.y += Math.sin(t.angle) * t.speed + t.gravity, t.alpha -= t.decay, t.alpha <= t.decay && u.splice(e, 1)
},
draw: function() {
var e = this;
s.fillStyle = "hsla(" + e.hue + ", 100%, " + e.brightness + "%, " + e.alpha + ")", s.beginPath(), s.arc(e.coord.x, e.coord.y, 2, 0, 2 * Math.PI, !0), s.closePath(), s.fill()
}
}, window.requestAnimFrame = function() {
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || function(e) {
window.setTimeout(e, 1e3 / 60)
}
}(), $(".input_key").on("focus", function() {
o || (v(), o = !0, p());
var e = $(this.form),
t = -20,
n = -44;
i.appendTo(e), e.attr("name") == "f3" && ($("body").hasClass("layout1") ? t = 97 : t = -20), i.css({
left: t,
top: n
})
}).on("keydown", function(e) {
var t = $(this.form);
if (!(this.selectionStart >= 0 && r)) return;
var n = this.selectionStart,
i = this.value.substring(0, n).replace(/ /g, " "),
s = r.html(i).width(),
o = 0;
i.length > c ? o = -2 : o = 2, c = i.length, s >= 500 && (s = 500);
var a = f;
while (a--) u.push(new h(s + 50, 60, o));
// 这里是控制输入框都抖动的
t.css({
"-webkit-transform": "translate(-1px, 1px)",
"-moz-transform": "translate(-1px, 1px)",
"-MS-transform": "translate(-1px, 1px)",
"-o-transform": "translate(-1px, 1px)",
transform: "translate(-1px, 1px)"
}),
setTimeout(function() {
t.css({
"-webkit-transform": "none",
"-moz-transform": "none",
"-MS-transform": "none",
"-o-transform": "none",
transform: "none"
})
}, 10)
})
})();
</script>
</body>
</html>我相信看了本文案例你已經掌握了方法，更多精彩請關注php中文網其它相關文章！
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