<textareaname="ta1"rows=5cols=50>

aaaaaaaaaaaaaa

cccccccccc

dddddddddddd

fffffffffffff

</textarea>

<inputvalue="1"name="line">

<inputtype=buttononclick="goL(parseInt(line.value));"value="go">

<script>

functiongoL(Line)

{

ta1.focus();

varv=ta1.value.split('n');

ch=0;

for(vari=0;i<Line-1;i++)

ch+=v[i].length;

varo=ta1.createTextRange();

o.move("character",ch);

o.select();

}

</script>

aaaaaaaaaaaaaa bbbbbbbbbbbbbb cccccccccc dddddddddddd fffffffffffff

[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]