In practice, we often encounter a problem: how to automatically jump to the page after N seconds?
I encountered problems and searched for information myself, and summarized 3 methods
Method 1:
The simplest one: add code directly in the front
<span style="font-size:18px;"> </span><span style="font-size:24px;"> <meta http-equiv="refresh" content="3;URL=res.html"> </span> <span style="font-size:24px;"> //3秒之后自动跳转到res.html,两个属于同一文件下面,要是需要跳转到jsp页面,就需要在url里面填写url地址 </span>
Method 2:
You need to use the method in window:
setTimeout calculates an expression after the specified millisecond value.
Example:
window.setTimeout("alert('Hello, world')", 1000);
This is written in js code;
The specific implementation is as follows:
<script type="text/javascript"> onload=function(){ <span style="white-space:pre"> </span>//在进入网页的时候加载该方法 setTimeout(go, 3000); <span style="white-space:pre"> </span> /*在js中是ms的单位*/ }; function go(){ location.href="http://localhost:8080/TestDemo/index.jsp"; } </script> //3秒之后自动执行go方法,直接跳转到index.jsp页面
Method 3:
The flaw of the above two examples is that they can realize the jump, but they don’t know when to jump. To realize the countdown 3-2-1;
The settimeout method can no longer be done;
setInterval evaluates an expression after every specified millisecond value.
After the same time has passed, the corresponding function will be executed. Specific implementation method:
<script type="text/javascript"> onload=function(){ setInterval(go, 1000); }; var x=3; //利用了全局变量来执行 function go(){ x--; if(x>0){ document.getElementById("sp").innerHTML=x; //每次设置的x的值都不一样了。 }else{ location.href='res.html'; } } </script>
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