myChart.on('mouseover', function(params) {
stopTimer();
});

myChart.on('mouseout', function(params) {
startTimer();
});


var timer;
function doing() {
let option = myChart.getOption();
option.series[0].startAngle = option.series[0].startAngle - 1;
myChart.setOption(option);

}

function startTimer() {
timer = setInterval(doing, 5000);
}


function stopTimer() {

clearInterval(timer);

xzTimer = null;

}

setTimeout(startTimer, 500);

Done!