jquery - 想了解 domReady.done、domReady.timer 是什么意思吗？

Question

我在一本 JavaScript 书中找到了这个例子

// Checks to see if the DOM is ready for navigation
function isDOMReady() {
    // If we already figured out that the page is ready, ignore

    if (domReady.done) return false;
    // Check to see if a number of functions and elements are
    // able to be accessed
    if (document && document.getElementsByTagName && document.getElementById && document.body) {
        // If they're ready, we can stop checking
        clearInterval(domReady.timer);
        domReady.timer = null;
        // Execute all the functions that were waiting
        for (var i = 0; i < domReady.ready.length; i++)
        domReady.ready[i]();
        // Remember that we're now done
        domReady.ready = null;
        domReady.done = true;
    }
}

// calling the domReady function
domReady(function () {
    alert("The DOM is loaded!");
    tag("h1")[0].style.border = "4px solid black";
});

想了解什么domReady.done，是什么domReady.timer意思？

Answer 1

domReady.done是一个标志，一旦 DOM 准备好，就会设置为 true。domReady.timer是对间隔开始的引用/句柄，window.setInterval以便window.clearInterval()在 DOM 准备好后立即清除它，因为不再需要检查。