<html>
<head>
<script>
var status = false;
function setText(object) {
if (status == false) {
status = true;
object.innerHTML = "";
}
}
</script>
</head>
<body>
<textarea onclick="setText(this)">Please input...</textarea>
</body>
</html>
<html>
<head>
<script>
var status = false;
function setText(object) {
if (status == false) {
status = true;
object.innerHTML = "";
}
}
</script>
</head>
<body>
<textarea onclick="setText(this)">Please input...</textarea>
</body>
</html>
<head>
<title>TEST</title>
<style>
body, td {
font-family: verdana, arial, helvetica, sans-serif;
font-size: 12px;
}
</style>
<script type="text/javascript">
var iStart = 0;
var iEnd = 0;
function savePos(oTextBox){
//Firefox(
if (typeof(oTextBox.selectionStart) == "number") {
iStart = oTextBox.selectionStart;
iEnd = oTextBox.selectionEnd;
}
else {
if (document.selection) {
var range = document.selection.createRange();
if (range.parentElement().id == oTextBox.id) {
var range_all = document.body.createTextRange();
range_all.moveToElementText(oTextBox);
for (iStart = 0; range_all.compareEndPoints("StartToStart", range) < 0; iStart++)
range_all.moveStart('character', 1);
for (var i = 0; i <= iStart; i++) {
if (oTextBox.value.charAt(i) == '\n')
iStart++;
}
var range_all = document.body.createTextRange();
range_all.moveToElementText(oTextBox);
for (iEnd = 0; range_all.compareEndPoints('StartToEnd', range) < 0; iEnd++)
range_all.moveStart('character', 1);
for (var i = 0; i <= iEnd; i++) {
if (oTextBox.value.charAt(i) == '\n')
iEnd++;
}
}
}
}
}
function textboxSelect(oTextbox, iStart, iEnd){
alert(iStart);
alert(iEnd);
switch (arguments.length) {
case 1:
oTextbox.select();
break;
case 2:
iEnd = oTextbox.value.length;
/* falls through */
case 3:
if (document.all) {
//isIE
var oRange = oTextbox.createTextRange();
oRange.moveStart("character", iStart);
oRange.moveEnd("character", -oTextbox.value.length + iEnd);
oRange.select();
}
else
if (isMoz) {
oTextbox.setSelectionRange(iStart, iEnd);
}
}
oTextbox.focus();
}
</script>
</head>
<body>
<textarea id="ta" onclick="savePos(this);" onmousedown="savePos(this);" onmouseup="savePos(this);" onkeydown="savePos(this);" onkeyup="savePos(this);" style="width:400px;height:250px;">
123456789
</textarea>
<br>
<input type="button" unselectable="on" value="inp" onclick="textboxSelect(ta,iStart,iEnd);"/>
</form>
</body>
</html>
<html>
<head>
<script>
var status = false;
function setText(object) {
if (status == false) {
status = true;
object.innerHTML = "";
}
}
</script>
</head>
<body>
<form action="">
<textarea onclick="setText(this)" id="text1">Please input...</textarea>
<input type="submit" value="Submit"></input>
</form>
</body>
</html>
不好意思，忘加按钮了。