zoukankan      html  css  js  c++  java
  • js 延迟菜单

    1.效果图

    2.

    <!DOCTYPE html>
    <html>
    <head lang="en">
        <meta charset="UTF-8">
        <title></title>
        <link rel="stylesheet" type="text/css" href="miaov_style.css">
        <script>
            window.onload = function(){
                var aA = getByClassName(document, 'normal');
                var aSpan = getByClassName(document, 'float_layer');
                var timer = null;
    
                for(var i = 0; i < aA.length; i++){
                    aA[i].index = i; //给按钮加索引,这样与其他元素形成一个对应
                    aA[i].onmouseover = function(){
                        for(var i = 0; i < aSpan.length ; i++){ //目的是其他3个隐藏
                            aSpan[i].style.display = 'none';
                        }
                        aSpan[this.index].style.display = 'block';//当前的显示
                        clearInterval(timer);//从span移回到标题也不隐藏span
                    };
                    aA[i].onmouseout = function(){ //标题鼠标移开,对应的下面的内容消失,但不能立即消失,否则鼠标永远也倒不了下面的内容上了
                        var This = this;//此刻this 是指 aA[i]
                        timer = window.setTimeout(function(){
                            aSpan[This.index].style.display = 'none';
                            //aSpan[this.index].style.display = 'none';//不能写this,此刻this指向的是window
                        },1000);
                    }
    
                    aSpan[i].onmouseover = function(){
                        clearInterval(timer);//让定时器失效,span不隐藏
                    }
                    aSpan[i].onmouseout = function(){
                        var This = this;
                        timer = setTimeout(function(){
                            This.style.display = 'none'; //This == aSpan[i]
                        },500);
                    }
    
                }
    
                function getByClassName(parent, className){
                    var aTag = parent.getElementsByTagName("*");
                    var result = [];
                    var reg = new RegExp('\b'+ className + '\b','i');
                    for(var i = 0; i < aTag.length; i++){
                        if(reg.test(aTag[i].className)){
                            result.push(aTag[i]);
                        }
                    }
                    return result;
                }
            }
    
        </script>
    </head>
    <body>
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  • 原文地址:https://www.cnblogs.com/bravolove/p/5947543.html
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