Zepto滚动条动画

 

 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Zepto.scroll</title>
    <meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no"/>
    <style>
        body {margin:0;padding:0;}
        .box {width:400px;height:600px;margin:20px auto;border:1px solid #ccc;overflow-y:auto;}
        .btn-scroll {width:30px;height:30px;position:absolute;left:50%;top:200px;margin-left:160px;text-align:center;line-height:15px;background-color:#666;color:#fff;text-decoration:none;font-size:30px;}
        .btn-scroll:before {width:0;height:0;content:"";display:inline-block;border:7px solid transparent;border-bottom-color:#fff;}
    </style>
</head>
<body>




<div class="box">
    <p>0001</p>

    <p>0002</p>

    <p>0003</p>

    <p>0004</p>

    <p>0005</p>

    <p>0006</p>

    <p>0007</p>

    <p>0008</p>

    <p>0009</p>

    <p>0010</p>

    <p>0011</p>

    <p>0012</p>

    <p>0013</p>

    <p>0014</p>

    <p>0015</p>

    <p>0016</p>

    <p>0017</p>

    <p>0018</p>

    <p>0019</p>

    <p>0020</p>

    <p>0021</p>

    <p>0022</p>

    <p>0023</p>

    <p>0024</p>

    <p>0025</p>

    <p>0026</p>

    <p>0027</p>

    <p>0028</p>

    <p>0029</p>

    <p>0030</p>

    <p>0031</p>

    <p>0032</p>

    <p>0033</p>

    <p>0034</p>

    <p>0035</p>

    <p>0036</p>

    <p>0037</p>

    <p>0038</p>

    <p>0039</p>

    <p>0040</p>

    <p>0041</p>

    <p>0042</p>

    <p>0043</p>

    <p>0044</p>

    <p>0045</p>

    <p>0046</p>

    <p>0047</p>

    <p>0048</p>

    <p>0049</p>

    <p>0050</p>

    <p>0051</p>

    <p>0052</p>

    <p>0053</p>

    <p>0054</p>

    <p>0055</p>

    <p>0056</p>

    <p>0057</p>

    <p>0058</p>

    <p>0059</p>

    <p>0060</p>

    <p>0061</p>

    <p>0062</p>

    <p>0063</p>

    <p>0064</p>

    <p>0065</p>

    <p>0066</p>

    <p>0067</p>

    <p>0068</p>

    <p>0069</p>

    <p>0070</p>

    <p>0071</p>

    <p>0072</p>

    <p>0073</p>

    <p>0074</p>

    <p>0075</p>

    <p>0076</p>

    <p>0077</p>

    <p>0078</p>

    <p>0079</p>

    <p>0080</p>

    <p>0081</p>

    <p>0082</p>

    <p>0083</p>

    <p>0084</p>

    <p>0085</p>

    <p>0086</p>

    <p>0087</p>

    <p>0088</p>

    <p>0089</p>

    <p>0090</p>

    <p>0091</p>

    <p>0092</p>

    <p>0093</p>

    <p>0094</p>

    <p>0095</p>

    <p>0096</p>

    <p>0097</p>

    <p>0098</p>

    <p>0099</p>

    <p>0100</p>

    <p>0101</p>

    <p>0102</p>

    <p>0103</p>

    <p>0104</p>

    <p>0105</p>

    <p>0106</p>

    <p>0107</p>

    <p>0108</p>

    <p>0109</p>

    <p>0110</p>

    <p>0111</p>

    <p>0112</p>

    <p>0113</p>

    <p>0114</p>

    <p>0115</p>

    <p>0116</p>

    <p>0117</p>

    <p>0118</p>

    <p>0119</p>

    <p>0120</p>

    <p>0121</p>

    <p>0122</p>

    <p>0123</p>

    <p>0124</p>

    <p>0125</p>

    <p>0126</p>

    <p>0127</p>

    <p>0128</p>

    <p>0129</p>

    <p>0130</p>

    <p>0131</p>

    <p>0132</p>

    <p>0133</p>

    <p>0134</p>

    <p>0135</p>

    <p>0136</p>

    <p>0137</p>

    <p>0138</p>

    <p>0139</p>

    <p>0140</p>

    <p>0141</p>

    <p>0142</p>

    <p>0143</p>

    <p>0144</p>

    <p>0145</p>

    <p>0146</p>

    <p>0147</p>

    <p>0148</p>

    <p>0149</p>

    <p>0150</p>

    <p>0151</p>

    <p>0152</p>

    <p>0153</p>

    <p>0154</p>

    <p>0155</p>

    <p>0156</p>

    <p>0157</p>

    <p>0158</p>

    <p>0159</p>

    <p>0160</p>

    <p>0161</p>

    <p>0162</p>

    <p>0163</p>

    <p>0164</p>

    <p>0165</p>

    <p>0166</p>

    <p>0167</p>

    <p>0168</p>

    <p>0169</p>

    <p>0170</p>

    <p>0171</p>

    <p>0172</p>

    <p>0173</p>

    <p>0174</p>

    <p>0175</p>

    <p>0176</p>

    <p>0177</p>

    <p>0178</p>

    <p>0179</p>

    <p>0180</p>

    <p>0181</p>

    <p>0182</p>

    <p>0183</p>

    <p>0184</p>

    <p>0185</p>

    <p>0186</p>

    <p>0187</p>

    <p>0188</p>

    <p>0189</p>

    <p>0190</p>

    <p>0191</p>

    <p>0192</p>

    <p>0193</p>

    <p>0194</p>

    <p>0195</p>

    <p>0196</p>

    <p>0197</p>

    <p>0198</p>

    <p>0199</p>

    <p>0200</p>
</div>
<a href="javascript:;" class="btn-scroll"></a>




<script src="http://zeptojs.com/zepto.min.js"></script>
<script>
    ;(function($) {
        var DEFAULTS = {
            endY: 0,
            duration: 200,
            updateRate: 15
        };

        var interpolate = function (source, target, shift) {
            return (source + (target - source) * shift);
        };

        var easing = function (pos) {
            return (-Math.cos(pos * Math.PI) / 2) + .5;
        };

        var scroll = function(settings) {
            var options = $.extend({}, DEFAULTS, settings);

            if (options.duration === 0) {
                window.scrollTo(0, options.endY);
                if (typeof options.callback === 'function') options.callback();
                return;
            }

            var startY = window.pageYOffset,
                    startT = Date.now(),
                    finishT = startT + options.duration;

            var animate = function() {
                var now = Date.now(),
                        shift = (now > finishT) ? 1 : (now - startT) / options.duration;

                window.scrollTo(0, interpolate(startY, options.endY, easing(shift)));

                if (now < finishT) {
                    setTimeout(animate, options.updateRate);
                }
                else {
                    if (typeof options.callback === 'function') options.callback();
                }
            };

            animate();
        };

        var scrollNode = function(settings) {
            var options = $.extend({}, DEFAULTS, settings);

            if (options.duration === 0) {
                this.scrollTop = options.endY;
                if (typeof options.callback === 'function') options.callback();
                return;
            }

            var startY = this.scrollTop,
                    startT = Date.now(),
                    finishT = startT + options.duration,
                    _this = this;

            var animate = function() {
                var now = Date.now(),
                        shift = (now > finishT) ? 1 : (now - startT) / options.duration;

                _this.scrollTop = interpolate(startY, options.endY, easing(shift));

                if (now < finishT) {
                    setTimeout(animate, options.updateRate);
                }
                else {
                    if (typeof options.callback === 'function') options.callback();
                }
            };

            animate();
        };

        $.scrollTo = scroll;

        $.fn.scrollTo = function() {
            if (this.length) {
                var args = arguments;
                this.forEach(function(elem, index) {
                    scrollNode.apply(elem, args);
                });
            }
        };
    }(Zepto));
</script>

<script>
    $(".btn-scroll").on("click", function(e) {
        $(".box").scrollTo({
            endY: $(".box p").eq(99).offset().top,
            duration: 200,
            callback: function() {
                //
            }
        });
    });
</script>

</body>
</html>

 

 

 

 

 

 

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Zepto.scrollto</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no"/>
<style type="text/css">
    .wrap {overflow:auto;width:500px;height:400px;border:2px solid red;}
    .box {width:100%;overflow-y:auto;}
</style>
</head>

<body>

<div class="wrap">
    <div class="box">
        <p>0001
        </p>
        <p>0002
        </p>
        <p>0003
        </p>
        <p>0004
        </p>
        <p>0005
        </p>
        <p>0006
        </p>
        <p>0007
        </p>
        <p>0008
        </p>
        <p>0009
        </p>
        <p>0010
        </p>
        <p>0011
        </p>
        <p>0012
        </p>
        <p>0013
        </p>
        <p>0014
        </p>
        <p>0015
        </p>
        <p>0016
        </p>
        <p>0017
        </p>
        <p>0018
        </p>
        <p>0019
        </p>
        <p>0020
        </p>
        <p>0021
        </p>
        <p>0022
        </p>
        <p>0023
        </p>
        <p>0024
        </p>
        <p>0025
        </p>
        <p>0026
        </p>
        <p>0027
        </p>
        <p>0028
        </p>
        <p>0029
        </p>
        <p>0030
        </p>
        <p>0031
        </p>
        <p>0032
        </p>
        <p>0033
        </p>
        <p>0034
        </p>
        <p>0035
        </p>
        <p>0036
        </p>
        <p>0037
        </p>
        <p>0038
        </p>
        <p>0039
        </p>
        <p>0040
        </p>
        <p>0041
        </p>
        <p>0042
        </p>
        <p>0043
        </p>
        <p>0044
        </p>
        <p>0045
        </p>
        <p>0046
        </p>
        <p>0047
        </p>
        <p>0048
        </p>
        <p>0049
        </p>
        <p>0050
        </p>
        <p>0051
        </p>
        <p>0052
        </p>
        <p>0053
        </p>
        <p>0054
        </p>
        <p>0055
        </p>
        <p>0056
        </p>
        <p>0057
        </p>
        <p>0058
        </p>
        <p>0059
        </p>
        <p>0060
        </p>
        <p>0061
        </p>
        <p>0062
        </p>
        <p>0063
        </p>
        <p>0064
        </p>
        <p>0065
        </p>
        <p>0066
        </p>
        <p>0067
        </p>
        <p>0068
        </p>
        <p>0069
        </p>
        <p>0070
        </p>
        <p>0071
        </p>
        <p>0072
        </p>
        <p>0073
        </p>
        <p>0074
        </p>
        <p>0075
        </p>
        <p>0076
        </p>
        <p>0077
        </p>
        <p>0078
        </p>
        <p>0079
        </p>
        <p>0080
        </p>
        <p>0081
        </p>
        <p>0082
        </p>
        <p>0083
        </p>
        <p>0084
        </p>
        <p>0085
        </p>
        <p>0086
        </p>
        <p>0087
        </p>
        <p>0088
        </p>
        <p>0089
        </p>
        <p>0090
        </p>
        <p>0091
        </p>
        <p>0092
        </p>
        <p>0093
        </p>
        <p>0094
        </p>
        <p>0095
        </p>
        <p>0096
        </p>
        <p>0097
        </p>
        <p>0098
        </p>
        <p>0099
        </p>
        <p>0100
        </p>
    </div>
</div>

<script src="http://zeptojs.com/zepto.min.js"></script>
<script>
;(function($){
  $.extend($.fn, {
    scrollto: function(m){        
        var n = 0, timer = null, that = this;
        var smoothScroll = function(m){
            var per = Math.round(m / 50);
            n = n + per;
            if(n > m){
                clearInterval(timer);
                return false;
            }            
            that.scrollTop(n);
        };
        timer = setInterval(function(){
            smoothScroll(m);
        }, 20);
    }
  })
})(Zepto);

$(".wrap").on("click", function(){    
    $(".wrap").scrollto(2000);    
});
</script>
</body>
</html>

 

 

;(function($){
  var scrollToTopInProgress = false

  $.fn.scrollToTop = function(position){
    var $this = this,
      targetY = position || 0,
      initialY = $this.scrollTop(),
      lastY = initialY,
      delta = targetY - initialY,
      speed = Math.min(750, Math.min(1500, Math.abs(initialY-targetY))),
      start, t, y, frame = window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        function(callback){ setTimeout(callback,15) },
      cancelScroll = function(){ abort() }

    if (scrollToTopInProgress) return
    if (delta == 0) return

    function smooth(pos){
      if ((pos/=0.5) < 1) return 0.5*Math.pow(pos,5)
      return 0.5 * (Math.pow((pos-2),5) + 2)
    }

    function abort(){
      $this.off('touchstart', cancelScroll)
      scrollToTopInProgress = false
    }

    $this.on('touchstart', cancelScroll)
    scrollToTopInProgress = true

    frame(function render(now){
      if (!scrollToTopInProgress) return
      if (!start) start = now
      t = Math.min(1, Math.max((now - start)/speed, 0))
      y = Math.round(initialY + delta * smooth(t))
      if (delta > 0 && y > targetY) y = targetY
      if (delta < 0 && y < targetY) y = targetY
      if (lastY != y) $this.scrollTop(y)
      lastY = y
      if (y !== targetY) frame(render)
        else abort()
    })
  }
})(Zepto)

 

posted @ 2016-01-05 09:53  赵小磊  阅读(500)  评论(0)    收藏  举报
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