[sleep 函数] #utils

sleep.js

/**
 * @param {Number} sec Sleep second period.
 */
function sleep(sec) {
    sec = +sec;
    if (isNaN(sec)) {
        throw new Error('sleep(): arg "sec" must be a number.');
    }
	
	const startTime = Date.now();
	while(true) {
		let now = Date.now();
		if (now - startTime >= sec * 1000) {
			break;
		}
	}
}