How to stop "setInterval"

你必须在启动时存储这个时间间隔的 定时器，稍后你将使用这个值来停止它，使用 clearInterval函数:

$(function () {
var timerId = 0;


$('textarea').focus(function () {
timerId = setInterval(function () {
// interval function body
}, 1000);
});


$('textarea').blur(function () {
clearInterval(timerId);
});


});

将 setInterval的返回值存储在一个变量中，然后使用它来清除间隔。

var timer = null;
$("textarea").blur(function(){
timer = window.setInterval(function(){ ... whatever ... }, 2000);
}).focus(function(){
if(timer){
window.clearInterval(timer);
timer = null
}
});

SetInterval 返回一个 id，您可以使用它来取消 clearInterval ()的间隔

This is based on CMS's answer. The question asked for the timer to be restarted on the blur and stopped on the focus, so I moved it around a little:

$(function () {
var timerId = 0;


$('textarea').focus(function () {
clearInterval(timerId);
});


$('textarea').blur(function () {
timerId = setInterval(function () {
//some code here
}, 1000);
});
});