https://katsutanipan.jp/wp/wp-content/themes/katsutanipan/js/jquery.smoothScroll.js

1/**
2 * Plugin Name: jquery.SmoothScroll
3 * Plugin URI: http://2inc.org
4 * Description: スムーススクロールでページ内移動するためのプラグイン。指定要素のhashをもとに移動する。
5 * Version: 0.5.0
6 * Author: Takashi Kitajima
7 * Author URI: http://2inc.org
8 * Created: July 5, 2012
9 * Modified: February 8, 2016
10 * License: GPLv2+
11 *
12 * easing: http://gsgd.co.uk/sandbox/jquery/easing/
13 * @param { duration, easing, offset, hash )
14 */
15;( function( $ ) {
16	var methods = {
17		init : function( params ) {
18			var methods = {
19				scrollStop: function() {
20					targetBody.stop( true );
21				},
22				getTargetBody: function() {
23					if ( $( 'html' ).scrollTop() > 0 ) {
24						targetBody = $( 'html' );
25					} else if ( $( 'body' ).scrollTop() > 0 ) {
26						targetBody = $( 'body' );
27					}
28					return targetBody;
29				}
30			}
31
32			var defaults = {
33				duration: 1000,
34				easing  : 'easeOutQuint',
35				offset  : 0,
36				hash    : true
37			};
38			params = $.extend( defaults, params );
39
40			var targetBody;
41
42			return this.each( function( i, e ) {
43				$( e ).on( 'click.SmoothScroll', function() {
44					var targetHash = this.hash;
45					var offset = $( targetHash ).eq( 0 ).offset();
46					if ( !targetHash || offset === null || typeof offset === 'undefined' )
47						return;
48
49					var wst = $( window ).scrollTop();
50					if ( wst === 0 )
51						$( window ).scrollTop( wst + 1 );
52
53					targetBody = methods.getTargetBody();
54					if ( typeof targetBody === 'undefined' )
55						return;
56					targetBody.animate(
57						{
58							scrollTop: offset.top - params.offset
59						},
60						params.duration,
61						params.easing,
62						function() {
63							if ( params.hash === true ) {
64								history.pushState( '', '', targetHash );
65							}
66						}
67					);
68
69					if ( window.addEventListener )
70						window.addEventListener( 'DOMMouseScroll', methods.scrollStop, false );
71					window.onmousewheel = document.onmousewheel = methods.scrollStop;
72					return false;
73				} );
74			} );
75		},
76		off: function() {
77			$( this ).unbind( 'click.SmoothScroll' );
78		}
79	}
80
81	$.fn.SmoothScroll = function( method ) {
82		if ( methods[method] ) {
83			return methods[ method ].apply( this, Array.prototype.slice.call( arguments, 1 ));
84		} else if ( typeof method === 'object' || ! method ) {
85			return methods.init.apply( this, arguments );
86		} else {
87			$.error( 'Method ' +  method + ' does not exist' );
88		}
89	};
90} )( jQuery );