js代码：

window.alert = function(msg, callback) {

var div = document.createElement("div");

div.innerHTML = "

+ ".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; }"

+ ""

+ "

";

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：

alert.html

This is my HTML page.

alert("哈哈哈！！！看，没有标题~_~");

总结

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