Html 标签的事件绑定（转自 MSDN）

参考 MSDN 网页给 HTML 标签绑定 click 事件：

function makeFoldersCollapsible(folderIcon, openFolderIcon, pathToIcons, initializeHandler) {
    var elements = document.getElementsByClassName("folder");
    var length = elements.length;
    for (var i = 0; i < length; i++) {
        var folder = elements[i];
        folder.style.display = 'none';
        folder.initialize = initializeHandler;
        var div = folder.previousSibling;
        var firstChild = div.firstChild;

        var imagePlusMinus = document.createElement("img");
        imagePlusMinus.src = pathToIcons + "plus.png";
        imagePlusMinus.className = "imagePlusMinus";

        var imageFolder = document.createElement("img");
        imageFolder.src = pathToIcons + folderIcon;
        imageFolder.className = "imageFolder";
        setFolderImage(imageFolder, div, firstChild, pathToIcons, folderIcon);

        var handler = expandCollapseFolder(folder, imagePlusMinus, imageFolder, div, firstChild, pathToIcons, folderIcon, openFolderIcon);

        var skipImage = isLink(firstChild);
        if (skipImage) {
            div.insertBefore(imagePlusMinus, firstChild);
            imagePlusMinus.onclick = handler;
        } else {
            div.insertBefore(imageFolder, firstChild);
            div.insertBefore(imagePlusMinus, imageFolder);
            div.onclick = handler;
        }
    }
}

function isLink(element) {
    return element && element.tagName && element.tagName == "A";
}

function expandCollapseFolder(capturedFolder, capturedPlusMinus, capturedFolderImage, capturedDiv, capturedFirstChild, pathToIcons, folderIcon, openFolderIcon) {
    return function () {
        if (capturedFolder.style.display == 'none') {
            capturedPlusMinus.src = pathToIcons + "minus.png";
            if (capturedDiv.className != "projectCSInSolution" && capturedDiv.className != "projectVBInSolution") {
                capturedFolderImage.src = pathToIcons + openFolderIcon;
            }

            if (capturedFolder.initialize) {
                capturedFolder.initialize(capturedFolder);
                capturedFolder.initialize = null;
            }

            capturedFolder.style.display = 'block';
        }
        else {
            capturedPlusMinus.src = pathToIcons + "plus.png";
            setFolderImage(capturedFolderImage, capturedDiv, capturedFirstChild, pathToIcons, folderIcon);
            capturedFolder.style.display = 'none';
        }
    }
}

参考：

https://referencesource.microsoft.com/