我希望此代码仅在页面第一次加载时起作用。
有没有办法在 javascript 上不使用 IsPostBack ？
IsPostBack :获取一个值，该值指示页面是首次呈现还是正在加载以响应回发。 More here .
<script>
window.onload = function TimedCss()
{
setTimeout(myTimeout1, 0500)
setTimeout(myTimeout2, 1000)
setTimeout(myTimeout3, 1500)
setTimeout(myTimeout4, 2000)
setTimeout(myTimeout5, 2500)
setTimeout(myTimeout6, 3000)
}
}
function myTimeout1()
{
document.getElementById("LBLName").className = " animated fadeInLeft";
document.getElementById("LBLName").style.visibility = "visible";
}
function myTimeout2()
{
document.getElementById("LBLDescription").className = " animated rotateIn";
document.getElementById("LBLDescription").style.visibility = "visible";
}
function myTimeout3()
{
document.getElementById("P1").className = " animated zoomIn";
document.getElementById("P1").style.visibility = "visible";
}
function myTimeout4()
{
document.getElementById("TXTQuantity").className = " animated flipInY";
document.getElementById("TXTQuantity").style.visibility = "visible";
}
function myTimeout5()
{
document.getElementById("LBLPrice").className = " animated slideInLeft";
document.getElementById("LBLPrice").style.visibility = "visible";
}
function myTimeout6()
{
document.getElementById("BTNAddToCart").className += " animated fadeInUp";
document.getElementById("BTNAddToCart").style.visibility = "visible";
}
</script>
编辑 - 解决方案:
<script>
window.onload = function TimedCSS()
{
var isPostBack=<%= IsPostBack ? "true" : "false" %>
if (!isPostBack)
{
setTimeout(myTimeout1, 0500)
setTimeout(myTimeout2, 1000)
setTimeout(myTimeout3, 1500)
setTimeout(myTimeout4, 2000)
setTimeout(myTimeout5, 2500)
setTimeout(myTimeout6, 3000)
}
function myTimeout1()
{
document.getElementById("LBLName").className = " animated fadeInLeft";
document.getElementById("LBLName").style.visibility = "visible";
}
function myTimeout2()
{
document.getElementById("LBLDescription").className = " animated rotateIn";
document.getElementById("LBLDescription").style.visibility = "visible";
}
function myTimeout3()
{
document.getElementById("P1").className = " animated zoomIn";
document.getElementById("P1").style.visibility = "visible";
}
function myTimeout4()
{
document.getElementById("TXTQuantity").className = " animated flipInY";
document.getElementById("TXTQuantity").style.visibility = "visible";
}
function myTimeout5()
{
document.getElementById("LBLPrice").className = " animated slideInLeft";
document.getElementById("LBLPrice").style.visibility = "visible";
}
function myTimeout6()
{
document.getElementById("BTNAddToCart").className += " animated fadeInUp";
document.getElementById("BTNAddToCart").style.visibility = "visible";
}
</script>
最佳答案
在首次页面加载时将变量存储在 Cookie 中，并每次检查该变量的值。
引用this用于 Cookie 的使用。
[已更新]
我为 demo 创建了一个 html和 source为您服务 origin-same policy Cookie。
我将源代码复制到以下代码中进行备份。您必须在自己的源上执行以下代码，因为前面提到的源相同政策。
<!DOCTYPE>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>
<body>
<div id="pageLoadStatus"></div>
<script>
var _ = {};
/**
* Gets or sets cookies
* @param name
* @param value (null to delete or undefined to get)
* @param options (domain, expire (in days))
* @return value or true
*/
_.cookie = function(name, value, options)
{
if (typeof value === "undefined") {
var n, v,
cookies = document.cookie.split(";");
for (var i = 0; i < cookies.length; i++) {
n = $.trim(cookies[i].substr(0,cookies[i].indexOf("=")));
v = cookies[i].substr(cookies[i].indexOf("=")+1);
if (n === name){
return unescape(v);
}
}
} else {
options = options || {};
if (!value) {
value = "";
options.expires = -365;
} else {
value = escape(value);
}
if (options.expires) {
var d = new Date();
d.setDate(d.getDate() + options.expires);
value += "; expires=" + d.toUTCString();
}
if (options.domain) {
value += "; domain=" + options.domain;
}
if (options.path) {
value += "; path=" + options.path;
}
document.cookie = name + "=" + value;
}
};
var hasLoadedBefore = _.cookie('hasLoadedBefore');
if(!!hasLoadedBefore) $('#pageLoadStatus').text('This page has been loaded before.');
else $('#pageLoadStatus').text('This page loaded at first time.');
_.cookie('hasLoadedBefore', true);
</script>
</body>
</html>
关于javascript - 仅在首页加载时运行 Javascript，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38159371/