原創JS模擬Alert彈出框效果--自定義CSS樣式

由於系統默認alert彈出窗口不能自定義樣式，有可能不符合網站的風格，雖然網上應該有很多這樣的JS

但是還是自己寫的比較放心，順便練習一下對DOM的操作

支持IE6下的SELECT不能遮罩的問題，谷歌支持圓角，IE6下就比較丑了，四四方方的，不過可以自定義自己喜歡的樣式

聽取建議后，修改了position:fixed, IE6下用hack處理了。

點擊看效果:

點擊模擬Alert彈出框

點擊模擬Alert彈出框

點擊模擬Alert彈出框

所需CSS：

    <style type="text/css">
        #alertMsg {
            display: none;
            width: 400px;
            border: 1px solid #ddd;
            border-radius: 5px;
            box-shadow: 1px 1px 10px black;
            padding: 10px;
            font-size: 12px;
            position: absolute;
            text-align: center;
            background: #fff;
            z-index: 100000;
        }

        #alertMsg_info {
            padding: 2px 15px;
            line-height: 1.6em;
            text-align: left;
        }

        #alertMsg_btn1, #alertMsg_btn2 {
            display: inline-block;
            background: url(images/gray_btn.png) no-repeat left top;
            padding-left: 3px;
            color: #000000;
            font-size: 12px;
            text-decoration: none;
            margin-right: 10px;
            cursor: pointer;
        }

        #alertMsg_btn1 cite, #alertMsg_btn2 cite {
            line-height: 24px;
            display: inline-block;
            padding: 0 13px 0 10px;
            background: url(images/gray_btn.png) no-repeat right top;
            font-style: normal;
        }

    </style>

 使用方法，直接調用函數，傳遞所需定義的信息，支持定義是否有取消鍵：

alertMsg(msg, mode)  
//mode為空，即只有一個確認按鈕，mode為1時有確認和取消兩個按鈕

 

點擊模擬Alert彈出框

點擊模擬Alert彈出框

點擊模擬Alert彈出框

函數代碼：添加了一個獲取窗口尺寸的函數，又長長了很多，可以把獲取窗口的尺寸另外立一個函數放公共庫里面，這里只是為了方便演示，寫到一個函數里面

function alertMsg(msg, mode) { //mode為空，即只有一個確認按鈕，mode為1時有確認和取消兩個按鈕
        msg = msg || '';
        mode = mode || 0;
        var top = document.body.scrollTop || document.documentElement.scrollTop;
        var isIe = (document.all) ? true : false;
        var isIE6 = isIe && !window.XMLHttpRequest;
        var sTop = document.documentElement.scrollTop || document.body.scrollTop;
        var sLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
        var winSize = function(){
            var xScroll, yScroll, windowWidth, windowHeight, pageWidth, pageHeight;
            // innerHeight獲取的是可視窗口的高度，IE不支持此屬性
            if (window.innerHeight && window.scrollMaxY) {
                xScroll = document.body.scrollWidth;
                yScroll = window.innerHeight + window.scrollMaxY;
            } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac
                xScroll = document.body.scrollWidth;
                yScroll = document.body.scrollHeight;
            } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
                xScroll = document.body.offsetWidth;
                yScroll = document.body.offsetHeight;
            }

            if (self.innerHeight) {    // all except Explorer
                windowWidth = self.innerWidth;
                windowHeight = self.innerHeight;
            } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
                windowWidth = document.documentElement.clientWidth;
                windowHeight = document.documentElement.clientHeight;
            } else if (document.body) { // other Explorers
                windowWidth = document.body.clientWidth;
                windowHeight = document.body.clientHeight;
            }

            // for small pages with total height less then height of the viewport
            if (yScroll < windowHeight) {
                pageHeight = windowHeight;
            } else {
                pageHeight = yScroll;
            }

            // for small pages with total width less then width of the viewport
            if (xScroll < windowWidth) {
                pageWidth = windowWidth;
            } else {
                pageWidth = xScroll;
            }

            return{
                'pageWidth':pageWidth,
                'pageHeight':pageHeight,
                'windowWidth':windowWidth,
                'windowHeight':windowHeight
            }
        }();
        //alert(winSize.pageWidth);
        //遮罩層
        var styleStr = 'top:0;left:0;position:absolute;z-index:10000;background:#666;width:' + winSize.pageWidth + 'px;height:' +  (winSize.pageHeight + 30) + 'px;';
        styleStr += (isIe) ? "filter:alpha(opacity=80);" : "opacity:0.8;"; //遮罩層DIV
        var shadowDiv = document.createElement('div'); //添加陰影DIV
        shadowDiv.style.cssText = styleStr; //添加樣式
        shadowDiv.id = "shadowDiv";
        //如果是IE6則創建IFRAME遮罩SELECT
        if (isIE6) {
            var maskIframe = document.createElement('iframe');
            maskIframe.style.cssText = 'width:' + winSize.pageWidth + 'px;height:' + (winSize.pageHeight + 30) + 'px;position:absolute;visibility:inherit;z-index:-1;filter:alpha(opacity=0);';
            maskIframe.frameborder = 0;
            maskIframe.src = "about:blank";
            shadowDiv.appendChild(maskIframe);
        }
        document.body.insertBefore(shadowDiv, document.body.firstChild); //遮罩層加入文檔
        //彈出框
        var styleStr1 = 'display:block;position:fixed;_position:absolute;left:' + (winSize.windowWidth / 2 - 200) + 'px;top:' + (winSize.windowHeight / 2 - 150) + 'px;_top:' + (winSize.windowHeight / 2 + top - 150)+ 'px;'; //彈出框的位置
        var alertBox = document.createElement('div');
        alertBox.id = 'alertMsg';
        alertBox.style.cssText = styleStr1;
        //創建彈出框里面的內容P標簽
        var alertMsg_info = document.createElement('P');
        alertMsg_info.id = 'alertMsg_info';
        alertMsg_info.innerHTML = msg;
        alertBox.appendChild(alertMsg_info);
        //創建按鈕
        var btn1 = document.createElement('a');
        btn1.id = 'alertMsg_btn1';
        btn1.href = 'javas' + 'cript:void(0)';
        btn1.innerHTML = '<cite>確定</cite>';
        btn1.onclick = function () {
            document.body.removeChild(alertBox);
            document.body.removeChild(shadowDiv);
            return true;
        };
        alertBox.appendChild(btn1);
        if (mode === 1) {
            var btn2 = document.createElement('a');
            btn2.id = 'alertMsg_btn2';
            btn2.href = 'javas' + 'cript:void(0)';
            btn2.innerHTML = '<cite>取消</cite>';
            btn2.onclick = function () {
                document.body.removeChild(alertBox);
                document.body.removeChild(shadowDiv);
                return false;
            };
            alertBox.appendChild(btn2);
        }
        document.body.appendChild(alertBox);

    }

點擊模擬Alert彈出框

點擊模擬Alert彈出框

點擊模擬Alert彈出框