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JavaScript移動端模擬alert()方法

在移動端HTML5頁面中,由於alert()這個原生方法彈出框不太好看,且在各瀏覽器或WebView的樣子不統一,我們一般會自行實現一個模擬該方法的彈出框。而且這個是一個使用頻繁的方法,所以可以用JavaScript把它封裝起來,便於呼叫。

以下是我實現程式碼和demo,樣式可根據需要自行修改:

alert.js

(function(exports, undefined){
    'use strict';
    var document = exports.document;
    function createDiv(class_name){
        var div = document.createElement('div'
); div.setAttribute('class', class_name); document.body.appendChild(div); return div; } function Alert(){ if(!(this instanceof Alert)) return; return this; } Alert.prototype = { init: function(){ this.mask = this.mask || createDiv('mask'
); this.alert = this.alert || createDiv('alert'); this.initEvents.call(this); return this; }, show: function(message){ this.alert.innerHTML = message || ''; this.alert.style.display = this.mask.style.display = 'block'; }, hide: function
(){
this.alert.style.display = this.mask.style.display = 'none'; exports.event && (exports.event.stopPropagation(), exports.event.preventDefault()); }, initEvents: function(){ this.hideHandler = this.hideHandler || this.hide.bind(this); this.mask.addEventListener('touchend', this.hideHandler, false); }, removeEvents: function(){ this.mask.removeEventListener('touchend', this.hideHandler, false); this.hideHandler = null; }, reset: function(){ this.removeEvents.call(this); this.alert.style.display = this.mask.style.display = 'none'; } } var alert = new Alert().init(); exports.showAlert = alert.show.bind(alert); exports.hideAlert = alert.hide.bind(alert); })(window);

main.css

html, body{
    width: 100%;
    margin: 0;
    padding: 0;
}
html{
    overflow-x: hidden;
    overflow-y: auto;
}
ul{
    list-style: none;
    margin: 0;
    padding: 0;
}
p{
    padding: 0;
    margin: 0;
}
a{
    text-decoration: none;
}
/* mask */
.mask{
    width: 100%;
    height: 100%; 
    position: fixed;
    top: 0;
    left: 0;
    background-color: rgba(0, 0, 0, .7);
    display: none;
}
/* alert */
.alert{
    box-sizing: border-box;
    width: 60%;
    max-height: 40%;
    position: fixed;
    top: 50%;
    left: 0;
    right: 0;
    -webkit-transform: translateY(-50%);
    transform: translateY(-50%);
    margin: 0 auto;
    padding: 10px;
    background-color: #fcfcfc;
    border-radius: 4px;
    box-shadow: 0 0 4px;
    text-align: center;
    font-size: 10pt;
    font-weight: normal;
    word-wrap: break-word;
    overflow-x: hidden;
    overflow-y: auto;
    display: none;
}

index.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no" name="viewport">
    <meta content="yes" name="apple-mobile-web-app-capable">
    <meta content="black" name="apple-mobile-web-app-status-bar-style">
    <meta content="telephone=no" name="format-detection">
    <meta content="email=no" name="format-detection">
    <title>alert</title>
    <link rel="stylesheet" href="./css/main.css">
    <style>
        #btn_showAlert{
            width: 200px;
            height: 30px;
            line-height: 30px;
            margin: 100px auto 0;
            border-radius: 4px;
            background-color: #428bca;
            color: #fff;
            font-weight: bold;
            text-align: center;
        }
    </style>
</head>
<body>
    <div id="btn_showAlert">show a message.</div>
    <!-- javascript -->
    <script src="./js/alert.min.js"></script>
    <script>
        window.addEventListener('DOMContentLoaded', function(){
            initEvents();
        }, false);
        function initEvents(){
            // btn_showAlert
            document.querySelector('#btn_showAlert').addEventListener('touchend', function(){
                showAlert('This is a message.');
            }, false);
        }
    </script>
</body>
</html>