css实现对话框并居中，应用立即执行函数（需改进）

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css实现对话框并居中，应用立即执行函数（需改进）

2020-07-02 网页编程网 网页编程网

<link rel="stylesheet" href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.min.css">
<title>拖动对话框</title>
<style>
html,body{
    width: 100%;
    height: 100%;
    margin: 0;
    background:url(1.jpg) 0 0/100% 100% no-repeat;
}
h3{
    margin:0;
    font-weight: normal;
}
#model{
    position: absolute;
    top:50%;
    left:50%;
    /*margin-left:-225px;/*居中方法一*/
    /*margin-top:-175px;*/
    transform: translate(-50%,-50%);/*居中方法二*/
    width:450px;
    height: 350px;
    background-color: white;
    border-radius:15px;
    overflow: hidden;
}
.model-header{
width: 100%;
height: 50px;
background-color: #4896dc;
}
.model-header h3{
    float: left;
    color: white;
    line-height: 50px;
}
.model-header h3 .star{
    margin-left: 10px;
    color: #f1c747;
    font-size: 20px;
}
.model-header .fa-times{
    float: right;
    color: white;
    margin-top: 10px;
    margin-right: 10px;
    font-size: 22px;
}
</style>
</head>
<body>
<div id="model">
    <div class="model-header" id="js_model_header">
        <h3><i class="fa fa-star star"></i>可拖动的对话框</h3>
        <a class="fa fa-times"></a>
    </div>
</div>
求点击事件，x与y。
<script>
(function() {//立即执行函数
    var model=document.getElementById('model');
    model.style.left=(window.innerWidth/2-225)+'px';
    model.style.top=(window.innerHeight/2-175)+'px';/*用js设置居中*/
    model.onmousedown=function(ev){
        var oEvent =ev||window.event;
        var x=oEvent.clientX-model.offsetLeft;
        var y=oEvent.clientY-model.offsetTop;
        //console.log(x,y);
        model.onmousemove=function(ev){
            var oEvent =ev||window.event;
        var left=ev.clientX-x;
        var top=ev.clientX-y;
        model.style.left=left+'px';
        model.style.top=top+'px';
    }//onmousemove
    model.onmouseup=function(){
        model.onmousemove=null;
        model.onmouseup=null;
    }
    }

})();
</script>
</body>

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