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<script>
function setSelectText(el, start, end) {
if (el.createTextRange) {
var Range = el.createTextRange();
Range.collapse();
Range.moveEnd('character', end);
Range.moveStart('character', start);
Range.select();
}
if (el.setSelectionRange) {
el.focus();
el.setSelectionRange(start, end); //设光标
}
}
</script>
<textarea id="o"></textarea>
<input type="button" value="aaaa" onclick="setSelectText(document.getElementById('o'),3,5)" />
答案来自:http://bbs.blueidea.com/thread-2983429-1-1.html