传统的表单控件textarea元素中属性wrap的示例是什么？

//hard:?test=111111111111111111111%0D%0A1#
//soft:?test=1111111111111111111111111111#
<form action="#">
    <input id="hard" type="button" value="wrap:hard">
    <input id="soft" type="button" value="wrap:soft(默认)">
    <input id="set" type="submit" value="设置">    
    <textarea id="test" name="test"></textarea>        
</form>
<script>
var hard = document.getElementById('hard');
var soft = document.getElementById('soft');
var test = document.getElementById('test');
var set = document.getElementById('set');
hard.onclick = function(){
    test.setAttribute('wrap','hard');
}
soft.onclick = function(){
    test.setAttribute('wrap','soft');
}
</script>