js怎么给输入框增加动画效果

来源：动视网责编：小采时间：2020-11-27 19:54:24

js怎么给输入框增加动画效果

js怎么给输入框增加动画效果:这次给大家带来js怎么给输入框增加动画效果，js给输入框增加动画效果的注意事项有哪些，下面就是实战案例，一起来看一下。<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </h

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导读js怎么给输入框增加动画效果:这次给大家带来js怎么给输入框增加动画效果，js给输入框增加动画效果的注意事项有哪些，下面就是实战案例，一起来看一下。<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </h

这次给大家带来js怎么给输入框增加动画效果，js给输入框增加动画效果的注意事项有哪些，下面就是实战案例，一起来看一下。

<!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>

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js怎么给输入框增加动画效果

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