本文主要为大家详细介绍了js实现数字变动效果，具有一定的参考价值，感兴趣的小伙伴们可以参考一下，希望能帮助到大家。
本文实例为大家分享了js实现数字变动效果展示的具体代码，供大家参考，具体内容如下
$.fn.countto = function (options) {
options = options || {};//当options未被初始化，即typeof options = 'undefined'时，执行后面部分即var options = {}来初始化一个对象
return $(this).each(function () {
// set options for current element
var settings = $.extend({}, $.fn.countto.defaults, {
from: $(this).data('from'),
to: $(this).data('to'),
speed: $(this).data('speed'),
refreshinterval: $(this).data('refresh-interval'),
decimals: $(this).data('decimals')
}, options);
// how many times to update the value, and how much to increment the value on each update
//更新值多少次，每次更新值多快
var loops = math.ceil(settings.speed / settings.refreshinterval),
increment = (settings.to - settings.from) / loops;
// references & variables that will change with each update
//引用和变量每次更新将改变
var self = this,//返回html对象
$self = $(this),//返回返回一个jquery对象
loopcount = 0,
value = settings.from,
data = $self.data('countto') || {};//获取jauery方法对象
$self.data('countto', data);//赋值
// if an existing interval can be found, clear it first
//如果存在间隔，则清除它
if (data.interval) {
clearinterval(data.interval);
}
data.interval = setinterval(updatetimer, settings.refreshinterval);
// initialize the element with the starting value
//用开始的值初始化
render(value);
function updatetimer() {
value += increment;
loopcount++;
render(value);
if (typeof(settings.onupdate) == 'function') {
settings.onupdate.call(self, value);
}
if (loopcount >= loops) {
// remove the interval
$self.removedata('countto');
clearinterval(data.interval);
value = settings.to;
if (typeof(settings.oncomplete) == 'function') {
settings.oncomplete.call(self, value);
}
}
}
function render(value) {
var formattedvalue = settings.formatter.call(self, value, settings);
$self.html(formattedvalue);
}
});
};
$.fn.countto.defaults = {
from: 200, // the number the element should start at
to: 0, // the number the element should end at
speed: 1000, // how long it should take to count between the target numbers
refreshinterval: 1, // how often the element should be updated
decimals: 0, // the number of decimal places to show
formatter: formatter, // handler for formatting the value before rendering
onupdate: null, // callback method for every time the element is updated
oncomplete: null // callback method for when the element finishes updating
};
function formatter(value, settings) {
return value.tofixed(settings.decimals);
}
// custom formatting example
$('#count-number').data('counttooptions', {
formatter: function (value, options) {
return value.tofixed(options.decimals).replace(/\b(?=(?:\d{3})+(?!\d))/g, ',');
}
});
// start all the timers
$('.timer').each(count);
function count(options) {
var $this = $(this);
options = $.extend({}, options || {}, $this.data('counttooptions') || {});
$this.countto(options);
}
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以上就是实例详解js实现简单数字变动效果的详细内容。