<div id="div1">
     <input id='word' type="text" placeholder="輸入英文單詞" />
     <div id='desc'></div>
</div>

#div1 {
            width: 200px;
            height: 200px;
            padding: 50px;
            background-color: lightgray;
            border: 1px solid black;
            margin: 100px auto
        }
 
        #word {
            width: 200px;
            height: 30px;
            font-size: 18px;
        }
 
        #desc {
            width: 200px;
            height: 150px;
            margin-top: 20px;
            background-color: lightgreen
        }

 <script src='demo.js'></script>
    <script>
        // 將字符串通過(guò)換行進(jìn)行字符串分割為數(shù)組
        let arr = word.split("\n");
 
        // 創(chuàng)建Map方法
        let map = new Map();
 
        // 遍歷數(shù)組
        for (var i = 0; i < arr.length - 1; i += 2) {
            map.set(arr[i].substring(1), arr[i + 1].substring(6));
        }
 
        window.onload = function () {
            let oWord = document.getElementById("word");
            let oDesc = document.getElementById("desc");
 
            oWord.onkeyup = function () {
                let value = map.get(this.value);
                if (value) {
                    oDesc.innerHTML = value;
                } else {
                    oDesc.innerHTML = "查無(wú)此詞";
                }
            }
        }
</script>