代码
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<style>
input { border: 1px solid #eee; padding: 4px 8px; min-width: 300px; font-size: 14px; height: 40px; display: block; margin: 0 auto; outline: none; }
.result { text-align: center; }
</style>
<div>
<input type="text">
<div class="result"></div>
</div>
<script>
var input = document.querySelector('input');
var result = document.querySelector('.result');
var timer = null;
input.addEventListener('input', function(e) {
clearTimeout(timer);
timer = setTimeout(function() {
var val = e.target.value;
result.innerText = '联想内容：' + val;
}, 300);
});
</script>
运行结果