行動端橫向滑屏和「橡皮筋」特效實例代碼

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首頁 MV 悅單 V榜 音樂 商城 節目 飯糰 諮詢 商城 節目 飯糰 諮詢 我的家 APP下載 熱門應用 document.addEventListener('touchstart', function(e) { e.preventDefault(); }); (function(){ var navWrap = document.querySelector(' . navWrap'); var navs = document.querySelector('#navs'); var start,startEl,lastTime,lastDis,lastSpeed; var min = 0; var max = 0 ; var TC = .25;//拉力係數 /* lastTime 上一次時間 lastDis 上一次位置 lastSpeed 上一次速度 */ navWrap. addEventListener ('touchstart', function(e) { var touch = e.changedTouches[0]; start = touch.pageX; startEl = css(navs,"left"); lastTime = Date.now(); lastDis = touch.pageX; min = navWrap.clientWidth - navs.offsetWidth; }); navWrap.addEventListener('touchmove', function(e ) { var touch = e.changedTouches[0]; var now = touch.pageX; var x = now - start + startEl; var nowTime = Date.now(); 如果（x > 最大值）{ x *= TC; } else if(x // 為什麼位移的幅度沒有減少？ x = (x - min)*TC + min; } css(navs,"left",x); lastSpeed = (touch.pageX - lastDis)/(nowTime - lastTime ); //得到上一次和這次的滑動速度 lastDis = touch.pageX; lastTime = nowTime; }); navWrap.addEventListener('touchend', function (e) { //console.log(lastSpeed);//最後一次滑動的速度 /* 速越快，緩衝的距離越大*/ if(Date.now() - lastTime > 100){ //如果最後一次的move時間和我抬起的時候，相差比較大，說明我在抬起之前，有一定時間沒有移動過，那鬆手之後，也應該保持不動 lastSpeed = 0; } lastSpeed = Math.abs(lastSpeed) var translate = lastSpeed * 200;//這是要緩衝出去距離 translate = Math.abs(translate) > 1000?1000*(translate/Math.abs(translate)):translate; var target = translate + css(navs,"left"); # var type = "easeOutStrong"; if(target > max){ target = 0; type = "backOut"; } else if(target target = min; type = "backOut"; } var time = Math.abs((target -css(navs,"left")) * 1.3); time = (time&gt ;0&&time console.log(time); startMove({ el:navs, target: { left: target }, time: time, type: type }); }); })();

//形式動畫公式 var Tween = { 線性: function (t, b, c, d){ return c*t/d + b; }, escapeIn: function(t, b, c, d){ return c*(t/=d)*t + b; }, escapeOut: function(t, b, c, d ) ){ return -c *(t/=d)*(t-2) + b; }, escapeBoth: function(t, b, c, d){ if ( (t/=d/2) 回傳 c/2*t*t + b; } 回傳 -c/2 * ((--t)*(t- 2) - 1) + b; }, escapeInStrong: function(t, b, c, d){ return c*(t/=d)*t*t*t + b; }, easyOutStrong: function(t, b, c, d){ return -c * ((t=t/d-1)*t*t*t - 1) + b; }, easyBothStrong: function(t, b, c, d){ if ((t/=d/2) return c/2*t*t * t*t + b; } return -c/2 * ((t-=2)*t*t*t - 2) + b; }, elasticIn: 函數( t, b, c, d, a, p){ if (t === 0) { return b; } if ( (t /= d) == 1 ) { return b+c; } if (!p) { p=d*0.3; } if (!a || a a = c; var s = p/4; } else { var s = p/(2*Math.PI) * Math.asin (c/a); } return - (a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b; }, elasticOut: function(t, b, c, d, a, p){ if (t === 0) { return b; } if ( (t /= d ) == 1 ) { return b+c; } if (!p) { p=d*0.3; } if (!a || a a = c; var s = p / 4; } else { var s = p/(2*Math.PI) * Math . asin (c/a); } return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b; }, elasticBoth: function(t, b, c, d, a, p){ if (t === 0) { return b; } if ( (t /= d/2) == 2 ) { return b+c; } if (!p) { p = d*(0.3 * 1.5); } if ( !a || a a = c; var s = p/4; } else { var s = p/(2*Math.PI) * Math.asin (c/a); } if (t return - 0.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2 * Math.PI)/p )) + b; } return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s ) *(2*Math.PI)/p )*0.5 + c + b; }, backIn: function(t, b, c, d, s){ if (typeof s = = '未定義') { s = 1.70158; } # return c*(t/=d)*t*((s+1)*t - s) + b; } , backOut: function(t, b, c, d, s){ if (typeof s == 'undefined') { s = 2.70158; //回縮的距離 } return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b; } , backBoth: function(t, b, c, d, s){ if (typeof s == 'undefined') { s = 1.70158; } if ((t /= d/2 ) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b; } 返回c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b; }, ounceIn: function(t, b, c, d){ return c - Tween['bounceOut'](d-t, 0, c, d) + b; }, ounceOut: function(t, b, c, d){ if ((t/=d) return c*(7.5625*t* t) + b; } else if (t return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b; } else if (t return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b; } return c*( 7.5625*(t-=(2.625/2.75))*t + 0.984375) + b; }, ounceBoth: function(t, b, c, d){ if ( t 返回Tween['bounceIn'](t*2, 0, c, d) * 0.5 + b; } 返回Tween['bounceOut'](t *2-d, 0, c, d) * 0.5 + c*0.5 + b; } } //取得或設定樣式 function css(el,attr,val){ if( arguments.length == 2){ if(el.currentStyle){ val = el.currentStyle[attr]; } else { val = getComputedStyle(el) [attr]; } return parseFloat(val); } else { if(attr == "opacity"){ el.style.opacity = val; el.style.filter = "alpha(opacity= "+val*100+")"; } else if(attr == "zIndex"){ el.style[attr] = Math.round( val); }else { el.style[attr] = val + "px"; } # } } //執行動畫 function startMove( init){ clearInterval(init.el.timer); var t = 0; var b = {}; var c = {}; var d = init.time/20; for( var s in init.target){ b[s] = css(init.el,s); c[s] = init.target[s] - b[s]; } init.el.timer = setInterval(function(){ t++; if(t > d){ clearInterval(init.el.timer); init.callBack&&init.callBack(); } else { for(var init .target 中的s){ var val = Tween[init.type](t,b[s],c[s],d); css(init.el,s,val); } } },20); }

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