js 让textarea文本内容框回车不划行
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<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script>
     
        window.onload = function(){
             
            document.getElementById('area').addEventListener('keydown',function(e){
             
                if(e.keyCode!=13) return;
                 
                e.preventDefault();
                 
                this.value += '';
             
            });
         
        };
     
    </script>
</head>
<body>
    <textarea name="" id="area" cols="30" rows="10"></textarea>
</body>
</html>