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。

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<script></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 = $(&#39;<canvas width="&#39; + e + &#39;" height="&#39; + t + &#39;" />&#39;).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>

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