The difference between setTimeout and setInterval in JS

setTimeout

function hello(){
 alert("hello");
 }
 // Execute the method using the method name
 var t1 = window.setTimeout(hello,1000);
 var t2 = window.setTimeout("hello()",3000);//Execute method using string
 window.clearTimeout(t1);//Clear timer

setInterval

//Real-time refresh time unit is milliseconds
 setInterval('refreshQuery()',8000);
 /* refresh query */
 function refreshQuery(){
    $("#mainTable").datagrid('reload',null);
 }

Recommended tutorial: “JS Tutorial”

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