如何在textarea中的每一行复制文本

Question

如何在textarea中的每一行复制文本

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<!--
first, im gonna paste my text in input like this..

<textarea id="input">
one

two






three

four


five



six


seven


(and so on...)
</textarea>

duplicating text is depend on break line..

and the result is like this..

Result:
one
one
two
two
two
two
two
two
two
three
three
four
four
four
five
five
five
five
six
six
six
seven
seven
seven
seven
-->

here is my code:
<textarea id="input" style="width:100%; height:100px;" placeholder="input" ></textarea>
<textarea id="output" style="width:100%; height:100px;" placeholder="output" ></textarea>
<input id="process" type="button" value="Process!" />

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谢谢你提前

Answer 1

试试这个，它会复制每一行的文字..

$(':button').click(function(){
    var invalue = $('#input').val();
    $('#output').val(invalue.replace(/^(.*)$/gm, '$1\n$1'))
})