JavaScript对象(窗口对象 定时器对象 )

1:窗口时间

confirm(str):确认对话框,确认返回trun,取消返回false,但是必须要有两个return;不然就算按下取消也会提交

第一个return:用于保证确认按钮运行

<script>
function update(){
var r = confirm("go on updating?");
return r;
}
</script>

第二个return:用于保证取消按钮也能运行

<form>
<input type="text" name="user"/>
<input type="submit" value="提交" onclick="return update()">
</form>

全部代码:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>window对象</title>
<script>
function update(){
var r = confirm("go on updating?");
return r; }
</script>
</head> <body>
<form>
<input type="text" name="user"/>
<input type="submit" value="提交" onclick="return update()">
</form>
</body>
</html>

代码效果:

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提交之后:最终保证confirm顺利执行

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAYUAAAERCAIAAAAbtixKAAASWElEQVR4nO2dTW8b19mG5+dQsAH/ATVOu3Czk4QA9KLQD2BXXojRzowjw7VciZxPB27yJqg/9hJgB0rRoEVlI4vWjtMqrqAX3hjGC8cSkSqyDVg24Hcx/BgOKZWUDmee88x1Q7Apaq7hjMBzY2Z45pJzZWnZC8IoirwgvLK0HIZRFEWuFywtN6IoiqKo3vDqDS9+vLTccD0/iqIwjAABAQHNgo4XhH4QBWHkB1H8OP5KPA799uP+BQABAQFNgU4URUEYLV75vR9EURS5fnBlablVb663VG9V3XK9UXdbVXdladn1AkBAQECzoHNAsQ1bcoCAgICmQKfnXO73Rz0JBAQEBDw26IRh5AeR6wd+EIVh5Aeh57fO7rwg9PwwCKMgjDw/9IKwdcrnh34QAgICApoFnSiK/CC6srTsB1EURZ4fduqt4fr1htuuOrfh+p2q8/wAEBAQ0CzouF4QP+sHUeex54euFwRhFMb15odhGAVh5HqB54ephQEBAQGNgM7ScqNzLre03Aja53LL7XpruH6n3uoNN748HoYRICAgoFmwdb5Wd71WSwVhw/XjJTw/cL0gDKMwiuut9UFdw/Xj1QECAgIaBFt9tFRvdI6a6g23c8W70Z440HC9Tr3VG27n0AsQEBDQFOjUG57faqyw3jqMijw/bLh+Z9Wt1UVRw/Xj1QVhBAgICGgWPLSPooErDf771gACAgKODrbO15aPetAFCAgIaAoc4np2dNSrWYCAgIAjXc8+6LO3+lE/tAMEBAQ8Gui4nh+3lB9EncdeelJTEA6Y1AQICAhoEuR+EUBAQClg+35aL3lvW+ux13dTXNi6KS7wOzfFAQICAhoCe30jedsqAQEBiwziqwUEBJQC4qsFBASUAuKrBQQElALiqwUEBJQC4qsFBASUAjL/CBAQUAqIrxYQEFAKiK8WEBBQCoivFhAQUAqIrxYQEFAKiK8WEBBQCoivFhAQUAqIrxYQEFAKiK8WEBBQCoivFhAQUAqIrxYQEFAKyP0igICAUkB8tYCAgFJAfLWAgIBSQHy1gICAUkB8tYCAgFJAfLWAgIBSQHy1gICAUkB8tYCAgFJA5h8BAgJKAfHVAgICSgHx1QICAkoB8dUCAgJKAfHVAgICSgHx1QICAkoB8dUCAgJKAfHVAgICSgHx1QICAkoB8dUCAgJKAfHVAgICSgG5XwQQEFAKiK8WEBBQCoivFhAQUAqIrxYQEFAKiK8WEBBQCoivFhAQUAqIrxYQEFAKiK8WEBBQCsj8I0BAQCmgTl/t5//zxcWLFyuEWJ6LFy9+8cUXQoZVBqBOX+3CwsLDhw/fEWJ5Hjx4cOHCBSHDKgNQp6+2Uqnk/UYixEwqlYqQYZUBqNNXSx8RNalUKkKGVQagTl8tfUTUpFKpCBlWGYA6fbX0EVGTbh/lPawyAHX6aukjoiYjna/JHI/Dgzp9tfQRUZP09WwLx+MI17MP+uzNLs1lCqSPiJpUKhUhwyoDUKevlj4iahJfP5IwrDIAdd4vQh8RNalUKkKGVRb3i4SSbJWmQPqIqEmlUhEyrDIAdfpq6SOiJvH1IwnDKgNQp6+WPiJqEh8fSRhWGYA6fbX0EVGTzvWj3IcVvtojgvQRUZORjo9kjsfhQZ2+WvqIqMlRrh8JG4/Dgzp9tfQRUZP4+EjCsMoAZP4RIaJTrPlHriRbpSmQPiJqMmh+tmXjcXhQp6+WPiJqEl8/kjCsMgDx1RIiOvhq7dNcuviPiNLgq7VPc5kC6SOiJvhq7dNcpkD6iKgJvlr7NJecrxGtwVdrn+YSXy3RGny19mkuUyB9RNQEX619mssAXy1RGny19k0z534RojXFul8klGSrNAXSR0RN8NXap7lMgfQRURN8tanHFmguUyB9RNQEX619mkt8tURr8NWOUHIyQfqIqAm+Wvs0lymQPiJqgq/WPs0ln68RrcFXa9+0BeYfCczKrHNqccP0ooVLseYfuZJslaZA+khCMuijlVknzuzK6LAlwVdrn+YyBdJHEnJ4yWwsnjpui6zMtlawMqu4kfDV2qe5xFcrMGPvo7GsS1zw1dqnuXQL5D/aWDzVPklZTI7DzrmLc0ANdMHu0UQ8kg857ekplc43KSzxeomtSP6g+/TsSmqp2ZWDV9zdnsRrLaZ7TnUd4au1UHOZAhX3UfLUZGW2M2R7zlgGnb5sLJ7qjuLuN3FHxQv3LJJ4vQP6qHc7ZlfSa1iZ7fRR58QqsbqNVJcetj3J9W4snuopwIFbrSn4au3TXKZAvX3Uew7UGdOpU6P+A4b0M22g5/lBxxmHHR8l135qcSP9bA+aODjrts3gPurbnkPWq/vQ6N27d/hqbdRcFuZ8TWYftZ4/oDeSRzTdReijIYOv1j7NZWF8tRuLp4yfrx3aRwku0Ss9J03dRRKnaIlFEpuT2OIR+uiA9RYk+Grt01ymQL199K7n0nDyevagq9UHgQccXww+2Bh0JXlj8VT86unX625Faun+LW4/O+B6dv/2DFzvuwJcPcJXG1mouQyK6avNbVpznqdJBThF6wm+WvummRfnfpGNxVkBxwZZd0L3Azrdcx8HpVj3i4SSbJWmQMV9NOCTqpy2IdsX755sKj896wu+Wvs0lylQdR+RYgVfbeqxBZrLFEgfETXBV2uf5hJfLdEafLUjlJxMkD4iaoKv1j7NZQqkj4ia4Ku1T3NZpM/XSLGCr9a+aQvFmX9EipZizT9yJdkqTYH0EVETfLX2aS5TIH1E1ARfrX2aS3y1RGvw1dqnuXSL4j8ihQu+Wvs0lymQPiJqgq/WPs1lCqSPiJrgq7VPc8n5GtEafLX2aS4L46slhQu+Wvs0lymQPiJqgq/WPs1lUExfLSlA8NXaN82c+0WI1hTrfpFQkq3SFEgfETXBV2uf5jIF0kdETfDVph5boLlMgfQRURN8tfZpLvHVEq3BVztCyckE6SOiJvhq7dNcpkD6iKgJvlr7NJd8vka0Bl+tfdMWmH9EtKZY849cSbZKUyB9RNQEX619mssUSB8RNcFXa5/mEl8t0Rp8tfZpLl38R0Rp8NXap7lMgfQRURN8tfZpLlMgfUTUBF+tfZpLzteI1uCrtU9zia+WaA2+Wvs0lymwUqn8HyEqgq/WPs1l0Oer/ZkQFcFXa9808/77RfJ+FxFiJsW6XySUZKs0BdJHRE3w1dqnuUyB9BFRE3y1qccWaC5TIH1E1ARfrX2ay35fbd7vIkLMBF/tCCUnE6SPiJrgq7VPc5kC6SOiJvhq7dNc8vka0Rp8tfZNW2D+EdGaYs0/ciXZKk2B9BFRE3y19mkuUyB9RNQEX619mst+X23e7yJCzARfrX2aS7fPf5T3u4gQM8FXa5/mMgVa0Ud//MsP5cafJmurOr7KjT/98S8/DL/7ruvOz8+fU5T5+XnXdY2/T/DV2qe5TIHy++jLbzZOh3878/fdDzbf6Pg68/fd0+HfvvxmY5jd/93ly57nPXv27K2iPHv2zPO8312+bPatgq/WPs2ldedrH9a/PvOP3d8+fp33hhjLbx+/PvOP3Q/rXw+zcLVaff78+f7+/ri3Ksvs7+8/f/68Wq2aXS2+Wvs0l/2+WrPvCeOZrK1+8O83eW+F4Xzw7zeTtdVhljx37tzbt2/HvT3Z5+3bt+fOnTO7Tny19mkuU6AtfbSrKyP10Zs32nZ/d3f3zZs34+gjIcMqAxBfbT6J++g/ujJqH+W9veYzpj4SMqwyALlfJJ/QR/TRkCnW/SKhJFulKdCKPvr1o/2fxpBvPz558uNvD1ng1lnn8AWOnF8/2h+pj0y85q2zTm8G7duts45z9tZPP/1062z7x99+fPLsrdSj42dMfSRkWGUA4qvNJ3EfNY+fm+XuSKzda96rnUyOzdq99EKDUr5pYEOazeZIfbS/b2L3m83mvdrJ1n7eq50s30zta/tX0LxZbv+Cyjfby/bQJrK/vz+m60cShlUGIL7afGKsj5rNZrN5sxyPqfb/zdQ4u1k+uHPaA9NARPRRcocGlk1yKYM732w2x9ZHQoZVBiC+2nwyWVs98+j1jpncKJdv7OzcrZ0sl/sPhMo3DL3Kf8+ZR69H6iMzr3o3eUhYvrGzc6N8snZ3Z2en8+hG2Wk/k6TG8JsZUx8JGVb4atX6aidrq2d+eL1tIuvnT8Rj8cT59etlp3x9e3v7evnE+fXt7e34++uHn645MXP8nPlhtD4y8qLb6+dPxDu7vX7+RPl657/Eg/iXVL7e/V2NZf+3t3M/PpI5HocH8dXmk8na6q++f/n4+Fmbn3Ccifm1tfmJifm1azN9Y23mWh9zbWZifs3Aa6fzq+9fDt9Hr169MvOqa/MTqb1dm5+Yudb5L7Vs364PWOzIefXqlYjrR8LG4/Agvtp8YqqPrs1MzMxMJPto5trjbuO0v3/8ONlC6vqotTudZlmbn5i51tMzrYV6uuvQzj5axtRHQoZVBiDzj/LJZG31lw9f/K+JfPVRqfTRV/G/n073jbXpT+PFPp1OPhy0xLHzy4cvRuojM6/at+fTn8a7WProq85Crb2Pl+3jjf0GxtRHQoYVvtojgrb00ZaJ3KmWStU7d6qlUrU67Uxf3dra2ro6Xare2drautp+4k615Djxc92fms6ofWTgJe9US60Surq1dadaivd26+p0+7mt9vfTV5OLpzr76kHrHzFj6iMhwyoDEF9tPpmsrb7/cG/TRG7PtcZYqVRypqLNzc3NzWiqNHd7c3MzmnKmoniRqej2XMlxpqLuT03n/Yd7w/fRy5cvTb/+7bnSVLR5e67klOZut/e69YN4jzsP+igzefny5ZiuH0kYVhmA+Grzidk+apdPZ6xFU6W5uSnHcZzS3O3kIOyUV08M1ZOAPnIcx0m0S7eIU8W0mfxVmGvnMfWRkGGFr/aIoB199N3eI115/7vR+ijv7TWfMfWRkGGVAYivNp9M1lZPP/h5Q1dOP/h5+D568eJF3ttrPi9evBjT9SMJwyoDEF9tPqGP6KMhg6/WPs2ljedrpx/8/E9dGbWP8t5e8xlTHwkZVhmA+GrzyWRt9b37u9/rynv3d4fvo729vby313z29vbw1R4HxFebTz6sf/3e+o+/uf/8Oy35zf3n763/OLzP/8mTJzs7O3lvtcns7Ow8efJkHD5/IcMqAxBfbT758puNSe+vv7j74y/u/0fJ190fJ72/Dvn3ji5fvtxoNJ4+fbqnKE+fPm00GpfH8/eOJAyrDEDuF8ktn//5XzNLa7n/HUdTXzNLa5//+V/D7/6lS5eq1er4/jpj9qlWq5cuXTL+PinW/SKhJFulKdCKPiJkmOCrtU9zmQLpI6Im+GpTjy3QXKZA+oioCb5a+zSX1vlqCRky+GpHKDmZIH1E1ARfrX2ayxRIHxE1wVdrn+aSz9eI1uCrtW/ago3zjwgZJsWaf+RKslWaAukjoib4au3TXKZA+oioCb5a+zSX1vlqCRky+Grt01y6tvmPCBky+Grt01ymQPqIqAm+Wvs0lymQPiJqgq/WPs0l52tEa/DV2qe5tM5XS8iQwVdrn+YyBdJHRE3w1dqnuUyBn3zyyb179/J+IxFy3Kyvr1+4cEHIsMoA1Hm/yB8++3xhYaFCiOVZWFj4w2efCRlW+GoBAQELBOr01QICAtoI6vTVAgIC2gjq9NUCAgLaCOr01QICAtoI6vTVAgIC2gjq9NUCAgLaCOqcfwQICGgjqNNXCwgIaCOo01cLCAhoI6jTVwsICGgjqNNXCwgIaCOo01cLCAhoI6jTVwsICGgjqNNXCwgIaCOo01cLCAhoI6jTVwsICGgjqNNXCwgIaCPI/SKAgIBSQHy1gICAUkB8tYCAgFJAfLWAgIBSQHy1gICAUkB8tYCAgFJAfLWAgIBSQHy1gICAUkDmHwECAkoB8dUCAgJKAfHVAgICSgHx1QICAkoB8dUCAgJKAfHVAgICSgHx1QICAkoB8dUCAgJKAfHVAgICSgHx1QICAkoB8dUCAgJKAblfBBAQUAqIrxYQEFAKiK8WEBBQCoivFhAQUAqIrxYQEFAKiK8WEBBQCoivFhAQUAqIrxYQEFAKyPwjQEBAKSC+WkBAQCkgvlpAQEApIL5aQEBAKSC+WkBAQCkgvlpAQEApIL5aQEBAKSC+WkBAQCkgvlpAQEApIL5aQEBAKSC+WkBAQCkg94sAAgJKAfHVAgICSgHx1QICAkoB8dUCAgJKAfHVAgICSgHx1QICAkoB8dUCAgJKAfHVAgICSgGZfwQICCgF/H9JJsB17c0hFgAAAABJRU5ErkJggg==" alt="" width="307" height="215" />

2:页面控制:window.open()控制打开页面

1:按钮控制打开多个

2:按钮控制打开一个,后面加上该网页的内容

<body>
<input type="button" value="可重复打开新的窗口" onclick="window.open('window对象.html')"/>
<input type="button" value="只能打开一个新的窗口" onclick="window.open('window对象.html','window对象')"/>
</body>

变成超链接的方式:

<a href="javascript:window.open('window对象.html','window对象')">windows对象</a>

打开网页的三种方式:

1:替换当前页面:

2:重复打开同一个连接:

3:同一个链接只能打开一次:

<p><a href="window对象.html">替换当前页面</a></p>
<p><a href="window对象.html" target="_blank">打开另一个选项卡</a></p>
<p><a href="#"onclick="javascript:window.open('window对象.html','window对象')">只能打开一次</a></p>

定时器对象:

多用于网页动态时钟,制作倒计时,跑马灯效果

周期性时钟:页面的倒计时

一次性时钟:等5s后关闭页面

往网页里面写回东西:

var s = hour+'小时'+minute+'分钟'+second+'秒';
h1.innerHTML = s;//任意元素中间的

页面一打开就执行函数:

window.addEventListener('load',miaosha,false)

秒杀:

var timer;
var miaosha = function(){
var h1 = document.getElementById("time");
var now= new Date();
//距离6点开始抢购
var hour = 19-now.getHours()-1;
var minute=59- now.getMinutes();
var second = 59- now.getSeconds();
var s = hour+'小时'+minute+'分钟'+second+'秒';
h1.innerHTML = s;//任意元素中间的正文 }
window.addEventListener('load',timerStart,false) function timerStart(){
timer = window.setInterval(miaosha,1000);
}

在JavaScript中,===表示完全相等,需要判断一个变量未定义,必须给他加上===等号

function stopTimer(){
if(timer===undefined)
timer = window.setInterval(miaosha,1000);
else
timer=clearInterval(timer); }

页面5s后关闭:

var timere;
function timeFunc(){
var h1= document.getElementById("h1");
var n =parseInt(h1.innerHTML);
h1.innerHTML = (n-1)+"s后自动关闭"
}
function startTimer(){
timere = setInterval(timeFunc,1000);
}
window.addEventListener('load',startTimer,false);

html:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="页面5秒关闭.js"></script>
<title>myAlert</title>
</head> <body>
<h1 id="h1">5s后自动关闭</h1>
留在此页面,请点击
<a href="#">这里</a>
</body>
</html>

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