CSS3新vw, vh單位與純CSS定位的彈框屏幕居中效果實例頁面

在css中vw和vh分別表明所佔的百分比，能夠設置最外部的容器的寬高，可是都要結合百分比一塊兒使用。

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圖片寬度（目前1024像素）： 128  1024

點擊我出現圖片彈框

代碼
CSS代碼：
.dialog_container {
    display: none;
    width: 100%;
    width: 100vw;
    height: 100%;
    height: 100vh;
    background-color: rgba(0,0,0,.35);
    text-align: center;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10;
}
.dialog_container:after {
    display: inline-block;
    content: '';
    width: 0;
    height: 100%;
    vertical-align: middle;
}
.dialog_box {
    display: inline-block;
    border: 1px solid #ccc;
    text-align: left;
    vertical-align: middle;
    position: relative;
}

.dialog_title {
    line-height: 28px;
    padding-left: 5px;
    padding-right: 5px;
    border-bottom: 1px solid #ccc;
    background-color: #eee;   
    font-size: 12px;
    text-align: left;
}

.dialog_close {
    position: absolute;
    top: 5px;
    right: 5px;
}

.dialog_body {
    background-color: #fff;   
}

.demo_image {
    -webkit-transition: width .3s;
    -moz-transition: width .3s;
    transition: width .3s;
}
HTML代碼：
<div id="dialogContainer" class="dialog_container">
    <div id="dialogBox" class="dialog_box">
        <div id="dialogTitle" class="dialog_title">尺寸動態可變圖片</div>
        <a href="javascript:" id="dialogClose" class="dialog_close">[關閉]</a>
        <div id="dialogBody" class="dialog_body">
         <img src="http://image.zhangxinxu.com/image/study/s/s512/mm1.jpg" class="demo_image" />
        </div>
    </div>
</div>
JS代碼：
(function() {
    if (typeof window.screenX === "number") {
        var $ = function(selector) {
            return document.querySelector(selector);   
        };   
       
        // 元素們
        var eleWidth = $("#imageWidth"), eleRange = $("input[type='range']"), eleBtn = $("#testButton"),
            eleDialog = $("#dialogContainer");
           
        eleBtn.addEventListener("click", function() {
            $("#dialogBody img").style.width = eleRange.value + "px";
            eleDialog.style.display = "inline";
        });
       
        eleRange.addEventListener("click", function() {
            eleWidth.innerHTML = this.value;
            $("#dialogBody img").style.width = this.value + "px";
        });
       
        $("#dialogClose").addEventListener("click", function() {
            eleDialog.style.display = "none";
            return false;
        });   
    } else {
        alert("您如今使用的瀏覽器內力不足，爲防止走火入魔，建議使用IE9+或Chrome 20+瀏覽器~~");   
    }
})();