JS 禁止粘贴的文本框

<body>
<script type="text/javascript">
//not IE is required
function fncKeyStop(evt)
{
    if(!window.event)
    {
        var keycode = evt.keyCode;
        var key = String.fromCharCode(keycode).toLowerCase();
        if(evt.ctrlKey && key == "v")
        {
          evt.preventDefault();
          evt.stopPropagation();
        }
    }
}
</script>
<input onkeydown="fncKeyStop(event)" onpaste="return false" oncontextmenu = "return false;" />
</body>
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原文地址：https://www.cnblogs.com/wantingqiang/p/1703765.html