JS takes the value of request and executes it automatically using the example

2020-03-30 02:06:33
OfStack

There are three common ways to automate JS functions in web pages
In the Head area of HTML, there is the following function:

 
<SCRIPT LANGUAGE="JavaScript"> 
functionn MyAutoRun() 
{ 
　//The following is the code of your function, please modify first!
　alert(" The function executes automatically! "); 
} 
</SCRIPT>

Next, let's take the above function and let it run automatically when the page loads!
The first method
Change the above code to:

 
<SCRIPT LANGUAGE="JavaScript"> 
functionn MyAutoRun() 
{ 
　//The following is the code of your function, please modify first!
　alert(" The function executes automatically! "); 
} 
window.onload=MyAutoRun(); //Just add this sentence
</SCRIPT>

The second method
Modify the Body of the page to:

 
<body onLoad="MyAutoRun();">

Or replace it with:

 
<body onLoad="javascript:MyAutoRun();">

The third way
Using JS timer to intermittently execute functions:

 
setTimeout("MyAutoRun()",1000); //The MyAutoRun() function is executed every 1000 milliseconds

To implement the method, change the top JS function to:

 
<SCRIPT LANGUAGE="JavaScript"> 
functionn MyAutoRun() 
{ 
　//The following is the code of your function, please modify first!
　alert(" The function executes automatically! "); 
} 
setTimeout("MyAutoRun()",1000); //That's it
</SCRIPT>

Other methods are more special, not commonly used, versatility is not big, not introduced!
You can also use EL& JSTL in JS

 
var step = "<c:out value='${step}' default='0'/>"; 
switch(step) { 
case"0": 
default: 
break; var step = "<c:out value='${step}' default='0'/>";