SVG+JS+CSS3實現菜單與關閉按鈕動畫

在這裏有個預覽,它是個挺著名的Hamburger Button,我把它簡化了一下,這裏是個預覽圖:

看起來很完美,可是其實你要是不斷的連續點擊,速度超過js對路徑的計算結果,那麼將是這樣:

雖然不會有用戶這樣作,但前端本身內心通常會糾結.其實直接用css3徹底能夠實現同等效果且不會出現上圖的尷尬.
時間關係,這裏上一下上圖的代碼,以供須要,至於css3的實現則週末有空再傳:

---

html:

<script src="js/main.js"></script>
<div id="menu-icon">
<svg xmlns="http://www.w3.org/2000/svg" width="1000px" height="1000px">
<path id="menuLineA" d="M 300 400 L 700 400 C 900 400 900 750 600 850 A 400 400 0 0 1 200 200 L 800 800"></path>
<path id="menuLineB" d="M 300 500 L 700 500"></path>
<path id="menuLineC" d="M 700 600 L 300 600 C 100 600 100 200 400 150 A 400 380 0 1 1 200 800 L 800 200"></path>
</svg>
<button id="menu-trigger" onclick='toggle_menu()'></button>
</div>

---

css:

body {
background: #4d4d6d;
}
#menu-icon {
position: relative;
display: inline-block;
width: 34px;
height: 34px;
margin: 2em;
transition: 0.1s;
}
#menu-icon svg {
position: absolute;
top: -33px;
left: -33px;
-webkit-transform: scale(0.1);
-ms-transform: scale(0.1);
transform: scale(0.1);
-webkit-transform-origin: 0 0;
-ms-transform-origin: 0 0;
transform-origin: 0 0;
}
#menu-icon svg path {
stroke: #fff;
stroke-width: 60px;
stroke-linecap: round;
stroke-linejoin: round;
fill: transparent;
}
#menu-icon svg path#menuLineA {stroke-dashoffset: 5803.15; stroke-dasharray: 2901.57, 2981.57, 240;}
#menu-icon svg path#menuLineB {stroke-dashoffset: 800; stroke-dasharray: 400, 480, 240;}
#menu-icon svg path#menuLineC {stroke-dashoffset: 6993.12; stroke-dasharray: 3496.56, 3576.56, 240;}
#menu-icon #menu-trigger {
position: relative;
width: 100%;
height: 100%;
cursor: pointer;
background: none;
border: none;
margin: 0;
padding: 0;
}
#menu-icon #menu-trigger:hover,
#menu-icon #menu-trigger:focus {
outline: none;
}

---

js:

/*segment.js*/
function Segment(t,e,n){this.path=t,this.length=t.getTotalLength(),this.path.style.strokeDashoffset=2*this.length,this.begin=e?this.valueOf(e):0,this.end=n?this.valueOf(n):this.length,this.timer=null,this.draw(this.begin,this.end)}Segment.prototype={draw:function(t,e,n,i){if(n){var s=i.hasOwnProperty("delay")?1e3*parseFloat(i.delay):0,a=i.hasOwnProperty("easing")?i.easing:null,h=i.hasOwnProperty("callback")?i.callback:null,r=this;if(this.stop(),s)return delete i.delay,this.timer=setTimeout(function(){r.draw(t,e,n,i)},s),this.timer;var l=new Date,o=1e3/60,g=this.begin,f=this.end,u=this.valueOf(t),d=this.valueOf(e);!function p(){var t=new Date,e=(t-l)/1e3,i=e/parseFloat(n),s=i;return"function"==typeof a&&(s=a(s)),i>1?(r.stop(),s=1):r.timer=setTimeout(p,o),r.begin=g+(u-g)*s,r.end=f+(d-f)*s,r.begin<0&&(r.begin=0),r.end>r.length&&(r.end=r.length),r.begin<r.end?r.draw(r.begin,r.end):r.draw(r.begin+(r.end-r.begin),r.end-(r.end-r.begin)),i>1&&"function"==typeof h?h.call(r.context):void 0}()}else this.path.style.strokeDasharray=this.strokeDasharray(t,e)},strokeDasharray:function(t,e){return this.begin=this.valueOf(t),this.end=this.valueOf(e),[this.length,this.length+this.begin,this.end-this.begin].join(" ")},valueOf:function(t){var e=parseFloat(t);if(("string"==typeof t||t instanceof String)&&~t.indexOf("%")){var n;~t.indexOf("+")?(n=t.split("+"),e=this.percent(n[0])+parseFloat(n[1])):~t.indexOf("-")?(n=t.split("-"),e=this.percent(n[0])-parseFloat(n[1])):e=this.percent(t)}return e},stop:function(){clearTimeout(this.timer),this.timer=null},percent:function(t){return parseFloat(t)/100*this.length}};
/*ease.min.js*/
!function(n,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t(n.ease={})}(this,function(n){"use strict";function t(n,t){return null==n||isNaN(n)?t:+n}function u(n,u){n=Math.max(1,t(n,1)),u=t(u,.3)*A;var i=u*Math.asin(1/n);return function(t){return n*Math.pow(2,10*--t)*Math.sin((i-t)/u)}}function i(n,u){n=Math.max(1,t(n,1)),u=t(u,.3)*A;var i=u*Math.asin(1/n);return function(t){return n*Math.pow(2,-10*t)*Math.sin((t-i)/u)+1}}function r(n,u){n=Math.max(1,t(n,1)),u=1.5*t(u,.3)*A;var i=u*Math.asin(1/n);return function(t){return n*((t=2*t-1)<0?Math.pow(2,10*t)*Math.sin((i-t)/u):Math.pow(2,-10*t)*Math.sin((t-i)/u)+2)/2}}function o(n){return n=t(n,1.70158),function(t){return t*t*((n+1)*t-n)}}function e(n){return n=t(n,1.70158),function(t){return--t*t*((n+1)*t+n)+1}}function c(n){return n=1.525*t(n,1.70158),function(t){return((t*=2)<1?t*t*((n+1)*t-n):(t-=2)*t*((n+1)*t+n)+2)/2}}function a(n){return 1-f(1-n)}function f(n){return B>n?L*n*n:D>n?L*(n-=C)*n+E:G>n?L*(n-=F)*n+H:L*(n-=J)*n+K}function h(n){return((n*=2)<=1?1-f(1-n):f(n-1)+1)/2}function s(n){return 1-Math.sqrt(1-n*n)}function M(n){return Math.sqrt(1- --n*n)}function p(n){return((n*=2)<=1?1-Math.sqrt(1-n*n):Math.sqrt(1-(n-=2)*n)+1)/2}function l(n){return Math.pow(2,10*n-10)}function w(n){return 1-Math.pow(2,-10*n)}function b(n){return((n*=2)<=1?Math.pow(2,10*n-10):2-Math.pow(2,10-10*n))/2}function d(n){return 1-Math.cos(n*R)}function y(n){return Math.sin(n*R)}function x(n){return(1-Math.cos(Q*n))/2}function q(n){return n*n*n}function k(n){return--n*n*n+1}function m(n){return((n*=2)<=1?n*n*n:(n-=2)*n*n+2)/2}function v(n){return n*n}function P(n){return n*(2-n)}function O(n){return((n*=2)<=1?n*n:--n*(2-n)+1)/2}function g(n){return+n}function I(n){return n=t(n,3),function(t){return Math.pow(t,n)}}function N(n){return n=t(n,3),function(t){return 1-Math.pow(1-t,n)}}function j(n){return n=t(n,3),function(t){return((t*=2)<=1?Math.pow(t,n):2-Math.pow(2-t,n))/2}}function z(n,t,u){var i=(n+="").indexOf("-");return 0>i&&(n+="-in"),arguments.length>1&&T.hasOwnProperty(n)?T[n](t,u):S.hasOwnProperty(n)?S[n]:g}var A=1/(2*Math.PI),B=4/11,C=6/11,D=8/11,E=.75,F=9/11,G=10/11,H=.9375,J=21/22,K=63/64,L=1/B/B,Q=Math.PI,R=Q/2,S={"linear-in":g,"linear-out":g,"linear-in-out":g,"quad-in":v,"quad-out":P,"quad-in-out":O,"cubic-in":q,"cubic-out":k,"cubic-in-out":m,"poly-in":q,"poly-out":k,"poly-in-out":m,"sin-in":d,"sin-out":y,"sin-in-out":x,"exp-in":l,"exp-out":w,"exp-in-out":b,"circle-in":s,"circle-out":M,"circle-in-out":p,"bounce-in":a,"bounce-out":f,"bounce-in-out":h,"back-in":o(),"back-out":e(),"back-in-out":c(),"elastic-in":u(),"elastic-out":i(),"elastic-in-out":r()},T={"poly-in":I,"poly-out":N,"poly-in-out":j,"back-in":o,"back-out":e,"back-in-out":c,"elastic-in":u,"elastic-out":i,"elastic-in-out":r};n.ease=z});
/*icon animate*/
function close_menu(a,b,c){a.draw('80% - 240', '80%', 0.3, {delay: 0.1,callback: function() {a.draw('100% - 545', '100% - 305', 0.6, {easing: ease.ease('elastic-out', 1, 0.3)});}});b.draw(20, 380, 0.1, {callback: function() {b.draw(200, 200, 0.3, {easing: ease.ease('bounce-out', 1, 0.3)});}});c.draw('80% - 240', '80%', 0.3, {delay: 0.1,callback: function() {c.draw('100% - 545', '100% - 305', 0.6, {easing: ease.ease('elastic-out', 1, 0.3)});}});}


function open_menu(a,b,c){
        a.draw('90% - 240', '90%', 0.1, {
            easing: ease.ease('elastic-in', 1, 0.3),
            callback: function() {
        a.draw('20% - 240', '20%', 0.3, {
            callback: function() {
        a.draw(80, 320, 0.7, {
            easing: ease.ease('elastic-out', 1, 0.3)
        });
            }
        });
            }
        });
b.draw(20, 380, 0.1, {callback: function() {b.draw(80, 320, 0.7, {delay: 0.1,easing: ease.ease('bounce-out', 2, 0.4)});}});
        c.draw('90% - 240', '90%', 0.1, {
            easing: ease.ease('elastic-in', 1, 0.3),
            callback: function() {
        c.draw('20% - 240', '20%', 0.3, {
            callback: function() {
        c.draw(80, 320, 0.7, {
            easing: ease.ease('elastic-out', 1, 0.3)
        });
            }
        });
            }
        });
    }
    function toggle_menu() {
        var menuIcon=document.getElementById('menu-icon'),
        segmentA = new Segment(document.getElementById('menuLineA'), 80, 320),
        segmentB = new Segment(document.getElementById('menuLineB'), 80, 320),
        segmentC = new Segment(document.getElementById('menuLineC'), 80, 320);
        if(menuIcon.getAttribute('menu-on')==1) {
                    open_menu(segmentA,segmentB,segmentC);
                              menuIcon.setAttribute('menu-on','0');
        } else {
            close_menu(segmentA,segmentB,segmentC);        
        menuIcon.setAttribute('menu-on','1');
        }

    }

感謝閱讀,但願對你有所幫助.