3344

标签：style 3344 width jd border display con

<head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> * { margin: 0; padding: 0; }

    .search {
        position: relative;
        width: 178;
        margin: 100px;
    }

    .con {
        display: none;
        position: absolute;
        top: -40px;
        width: 171px;
        border: 1px solid rgba(0, 0, 0, .2);
        box-shadow: 0 2px 4px rgba(0, 0, 0, .2);
        padding: 5px 0;
        font-size: 20px;
        line-height: 20px;
        color: #333;
    }

    .con::before {
        content: '';
        width: 0;
        height: 0;
        position: absolute;
        top: 28px;
        left: 18px;
        border: 8px solid #000;
        border-style: solid dashed dashed;
        border-color: #fff transparent transparent;
    }
</style>

</head> <body> <div class="search"> <div class="con"></div> <input type="text" placeholder="请输入您的快递单号" class="jd"> </div> <script> let con = document.querySelector('.con'); let jd = document.querySelector('.jd'); jd.addEventListener('keyup', function (e) { if (this.value == '') { con.style.display = "none"; } else { con.style.display = 'block'; con.innerHTML = this.value } })

    jd.addEventListener('blur', function () {
        con.style.display = "none";
    })
    jd.addEventListener('focus', function () {
        if (this.value != '') {
            con.style.display = "block";
        }
    })
</script>

</body>

标签：style,3344,width,jd,border,display,con
From： https://www.cnblogs.com/dexue/p/16905188.html

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