废话不多说了，直接给大家贴代码了，具体代码如下所示：

<script> window.alert = alert; function alert(data) { var MainDiv = document.createElement("div"), p = document.createElement("p"), AllPage = document.createElement("div"), btn = document.createElement("div"), textNode = document.createTextNode(data ? data : ""), btnText = document.createTextNode("确定"); // 控制样式 css(AllPage, { "position": "fixed", " _position": "absolute", " width": "100%", "height": "100%", "left": "0", "top": "0", "background": "rgba(0, 0, 0,0.5)", "-moz-opacity": "0.5", "filter": "alpha(opacity=50)", "z-index": "97", }); css(MainDiv, { "position": "fixed", "left": "0", "right": "0", "top": "30%", "width": "14rem", "height": "5rem", "padding-top":"0.5rem", "margin": "0 auto", "background-color": "white", "font-size": "0.75rem", "text-align": "center", "position": "relative", "border-radius": "5px 5px 5px 5px", }); css(btn, { "background": "#de241b", "color": "white", "width": "6rem", "margin-left": "4rem", "margin-bottom":"0.25rem", "height": "1.5rem", "border-radius": "5px 5px 5px 5px", "position": "absolute", "padding-top":"0.5rem", "bottom":"0", }) // 内部结构套入 p.appendChild(textNode); btn.appendChild(btnText); MainDiv.appendChild(p); MainDiv.appendChild(btn); AllPage.appendChild(MainDiv); // 整体显示到页面内 document.getElementsByTagName("body")[0].appendChild(AllPage); //禁止滚动 $("body").on("touchmove", function (event) { event.preventDefault; }, false) // 确定绑定点击事件删除标签 btn.onclick = function () { AllPage.parentNode.removeChild(AllPage); //启用滚动 $("body").off("touchmove"); } } function css(targetObj, cssObj) { var str = targetObj.getAttribute("style") ? targetObj.getAttribute("style") : ""; for (var i in cssObj) { str += i + ":" + cssObj[i] + ";"; } targetObj.style.cssText = str; }

以上所述是小编给大家介绍的使用JavaScript实现alert的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！