js重写alert事件（避免alert弹框标题出现网址）

时间：2021-05-26

js代码：

window.alert = function(msg, callback) { var div = document.createElement("div"); div.innerHTML = "<style type=\"text/css\">" + ".nbaMask { position: fixed; z-index: 1000; top: 0; right: 0; left: 0; bottom: 0; background: rgba(0, 0, 0, 0.5); } " + ".nbaMaskTransparent { position: fixed; z-index: 1000; top: 0; right: 0; left: 0; bottom: 0; } " + ".nbaDialog { position: fixed; z-index: 5000; width: 80%; max-width: 300px; top: 50%; left: 50%; -webkit-transform: translate(-50%, -50%); transform: translate(-50%, -50%); background-color: #fff; text-align: center; border-radius: 8px; overflow: hidden; opacity: 1; color: white; }" + ".nbaDialog .nbaDialogHd { padding: .2rem .27rem .08rem .27rem; } " + ".nbaDialog .nbaDialogHd .nbaDialogTitle { font-size: 17px; font-weight: 400; } " + ".nbaDialog .nbaDialogBd { padding: 0 .27rem; font-size: 15px; line-height: 1.3; word-wrap: break-word; word-break: break-all; color: #000000; } " + ".nbaDialog .nbaDialogFt { position: relative; line-height: 48px; font-size: 17px; display: -webkit-box; display: -webkit-flex; display: flex; } " + ".nbaDialog .nbaDialogFt:after { content: \" \"; position: absolute; left: 0; top: 0; right: 0; height: 1px; border-top: 1px solid #e6e6e6; color: #e6e6e6; -webkit-transform-origin: 0 0; transform-origin: 0 0; -webkit-transform: scaleY(0.5); transform: scaleY(0.5); } " + ".nbaDialog .nbaDialogBtn { display: block; -webkit-box-flex: 1; -webkit-flex: 1; flex: 1; color: #09BB07; text-decoration: none; -webkit-tap-highlight-color: transparent; position: relative; margin-bottom: 0; } " + ".nbaDialog .nbaDialogBtn:after { content: \" \"; position: absolute; left: 0; top: 0; width: 1px; bottom: 0; border-left: 1px solid #e6e6e6; color: #e6e6e6; -webkit-transform-origin: 0 0; transform-origin: 0 0; -webkit-transform: scaleX(0.5); transform: scaleX(0.5); } " + ".nbaDialog a { text-decoration: none; -webkit-tap-highlight-color: transparent; }" + "</style>" + "<div id=\"dialogs2\" style=\"display: none\">" + "<div class=\"nbaMask\"></div>" + "<div class=\"nbaDialog\">" + " <div class=\"nbaDialogHd\">" + " <strong class=\"nbaDialogTitle\"></strong>" + " </div>" + " <div class=\"nbaDialogBd\" id=\"dialog_msg2\">弹窗内容，告知当前状态、信息和解决方法，描述文字尽量控制在三行内</div>" + " <div class=\"nbaDialogHd\">" + " <strong class=\"nbaDialogTitle\"></strong>" + " </div>" + " <div class=\"nbaDialogFt\">" + " <a href=\"javascript:;\" class=\"nbaDialogBtn nbaDialogBtnPrimary\" id=\"dialog_ok2\">确定</a>" + " </div></div></div>"; document.body.appendChild(div); var dialogs2 = document.getElementById("dialogs2"); dialogs2.style.display = 'block'; var dialog_msg2 = document.getElementById("dialog_msg2"); dialog_msg2.innerHTML = msg; // var dialog_cancel = document.getElementById("dialog_cancel"); // dialog_cancel.onclick = function() { // dialogs2.style.display = 'none'; // }; var dialog_ok2 = document.getElementById("dialog_ok2"); dialog_ok2.onclick = function() { dialogs2.style.display = 'none'; callback(); };};

html引用：

<!DOCTYPE html><html><head><title>alert.html</title><meta charset="UTF-8"><meta name="keywords" content="keyword1,keyword2,keyword3"><meta name="description" content="this is my page"><meta name="content-type" content="text/html; charset=UTF-8"><!--<link rel="stylesheet" type="text/css" href="./styles.css" rel="external nofollow" >--> </head><body> This is my HTML page. <br> <script type="text/javascript" src="alert.js"></script> <script type="text/javascript"> alert("哈哈哈！！！看，没有标题~_~"); </script></body></html>

总结

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