1.为什么多加了 $(document).ready(function() { })就显示不出提示信息,写入不加可以显示提示信息?
2.将以下jq代码转换为原生js
为什么多加了 $(document).ready(function() { })就显示不出提示信息,源码不加可以显示提示信息?
第一个是写入网页运行完成准备加载,在js与jq混合使用的源码时候不建议这样呢,因为你的写入源码时代游戏攻略jq属于外部加载,blur属于js内置加载,源码大掌柜星际源码一种原因是写入js与其他插件混合加载,没声明方法导致的源码
例如一个jQ方法放在前,jQuery 源码在后就会报错,写入或者警告
将以下jq代码转换为原生js
jquery.downCount.js是源码依赖于jQuery的插件(效果:倒计时),所以我们需要查看该插件的写入源码才能将其变成源生代码。html代码:
<div class="p1"><span class="days"></span><span class="days_ref"></span>
<span class="hours"></span><span class="hours_ref"></span>
<span class="minutes"></span><span class="minutes_ref"></span>
<span class="seconds"></span><span class="seconds_ref"></span>
</div>
上面span中的源码class类是用于显示需要的类,在插件中days、写入汉源码头酒店hours、源码minutes、写入seconds分别用于显示天数、小时、肯德基app核销源码分钟、秒,days_ref、hours_ref、国家海关溯源码minutes_ref、seconds_ref分别用于显示单位days或day,hours或hour、minutes或minute、seconds或second。这些类都没有定义相应的样式,需要自己自定义样式。
js代码,只是简易的提了出来,如果需要更灵活的配置,自己再做进一步封装:
(function () {var container = document.querySelector(".p1");
var mydate = '1// ::',
myoffset = ,
callback = function () {
alert("执行完毕");
};
/
*** Change client's local date to match offset timezone
* @return { Object} Fixed Date object.
*/
var currentDate = function () {
// get client's current date
var date = new Date();
// turn date to utc
var utc = date.getTime() + (date.getTimezoneOffset() * );
// set new Date object
var new_date = new Date(utc + (*myoffset));
return new_date;
};
/
*** Main downCount function that calculates everything
*/
function countdown () {
var target_date = new Date(mydate), // set target date
current_date = currentDate(); // get fixed current date
// difference of dates
var difference = target_date - current_date;
// if difference is negative than it's pass the target date
if (difference < 0) {
// stop timer
clearInterval(interval);
if (callback && typeof callback === 'function') {
callback();
}
return;
}
// basic math variables
var _second = ,
_minute = _second * ,
_hour = _minute * ,
_day = _hour * ;
// calculate dates
var days = Math.floor(difference / _day),
hours = Math.floor((difference % _day) / _hour),
minutes = Math.floor((difference % _hour) / _minute),
seconds = Math.floor((difference % _minute) / _second),
// fix dates so that it will show two digets
days = (String(days).length >= 2) ? days : '0' + days,
hours = (String(hours).length >= 2) ? hours : '0' + hours,
minutes = (String(minutes).length >= 2) ? minutes : '0' + minutes,
seconds = (String(seconds).length >= 2) ? seconds : '0' + seconds;
// based on the date change the refrence wording
var ref_days = (days === 1) ? 'day' : 'days',
ref_hours = (hours === 1) ? 'hour' : 'hours',
ref_minutes = (minutes === 1) ? 'minute' : 'minutes',
ref_seconds = (seconds === 1) ? 'second' : 'seconds';
// set to DOM
document.querySelector('.days').innerHTML = days;
document.querySelector('.hours').innerHTML = hours;
document.querySelector('.minutes').innerHTML = minutes;
document.querySelector('.seconds').innerHTML = seconds;
document.querySelector('.days_ref').innerHTML = ref_days;
document.querySelector('.hours_ref').innerHTML = ref_hours;
document.querySelector('.minutes_ref').innerHTML = ref_minutes;
document.querySelector('.seconds_ref').innerHTML = ref_seconds;
};
// start
var interval = setInterval(countdown, );
})();