JS implements scheduled tasks, requesting background setInterval timing and ajax requests every N seconds

<span style="font-size: 16px"><strong><span style="color: #0000ff">DiGui = function<span style="color: #000000"> (param) {                
$.ajax({  
    success: <span style="color: #0000ff">function<span style="color: #000000"> (returnValue) {
        window.setInterval("fnSetMarkPoint()", 5000<span style="color: #000000">); 
    }
});<br/></span></span></span></span></span></strong></span>

After calling the DiGui() method

Problem: Create a setInterval every 0.1 seconds in a tree shape Create setInterval in a loop until the page crashes

Solution: Ensure that the setInterval object is only created once

Implementation plan: Define a Boolean variable for judgment var status= true;

 status =  = .: = .setInterval("()", 5000

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