HTML如何设置点击超链接变成灰色

//替换HTML元素

var replaceEach=function(targetNode, newNode) {

    var targetParentNode = targetNode.parentNode;

    var newParentNode = newNode.parentNode;

    //若 targetParentNode 和 newParentNode 都存在父节点

    if (targetParentNode && newParentNode) {

        targetParentNode.replaceChild(newNode.cloneNode(true), targetNode);

    } else {

        newParentNode.replaceChild(targetNode, newNode);

    }

};

addLoadEvent(getLinks);