HTML如何设置点击超链接变成灰色

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document.getElementsByTagName("a")

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var addLoadEvent=function(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
};

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var getLinks=function() {
if(!document.getElementsByTagName)return false;
if(!document.createElement)return false;
if(!document.getElementsByName("a"))return false;
    var links = document.getElementsByTagName("a");
    for (var i = 0; i < links.length; i++) {
        //判断href属性是否包含“#”符号
        if ((links[i].getAttribute("href").indexOf("#")) >= 0) {
            var para = document.createElement("p");
            var fon = document.createElement("font");
            fon.setAttribute("color", "#808080");
            fon.innerHTML =links[i].lastChild.nodeValue;
            var content = para.appendChild(fon);
            replaceEach(links[i], content);
        } else {
            links[i].style.color = "990033";
        }
    }
};

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//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);
    }
};

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addLoadEvent(getLinks);