如何禁用输入框中的多行/多列选择？

<input type="text" readonly />

<style>
    .no-select {
        user-select: none;
        -moz-user-select: none;
        -webkit-user-select: none;
        -ms-user-select: none;
    }
</style>

<input type="text" class="no-select" />

<input type="text" id="myInput" />

<script>
    var input = document.getElementById("myInput");
    input.addEventListener("mousedown", function(event) {
        event.preventDefault();
    });
</script>