下面的代码在IE,FF中都可以正常运行的<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title></title>
<script language="javascript" type="text/javascript">
function lessThan(e) {
if (!e) e = window.event;
var element = typeof event != "undefined" ? event.srcElement : e.target;
document.title = e.keyCode | e.which | e.charCode;
switch (e.keyCode | e.which | e.charCode) {
case 9: // table
case 8: // backspace
case 46: // delete
case 35: case 36: case 37: case 38: case 39: case 40: // home、end、left、up、right、down
case 116: // f5
return true; /* */
}
return element.value.length < element.getAttribute("maxlength");
}
</script>
</head><body>
<form>
<label id="l1">表单</label><br>
<input type="text" id="name" maxlength="10"/>
<p><label for="comments">我要留言:</label>
</p>
<input name="comments" id="comments" type="text" maxlength="10" onkeypress="return lessThan(event);"/>
</form>
</body>
</html>
但是在把上面的代码改写成这样时就FF就报错了
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title></title>
<script language="javascript" type="text/javascript">window.onload=function()
{
var _c=document.getElementById("comments");_c.onkeypress=function()
{
return lessThan(event);
}
}
function lessThan(e) {
if (!e) e = window.event;
var element = typeof event != "undefined" ? event.srcElement : e.target;
document.title = e.keyCode | e.which | e.charCode;
switch (e.keyCode | e.which | e.charCode) {
case 9: // table
case 8: // backspace
case 46: // delete
case 35: case 36: case 37: case 38: case 39: case 40: // home、end、left、up、right、down
case 116: // f5
return true; /* */
}
return element.value.length < element.getAttribute("maxlength");
}
</script>
</head><body>
<form>
<label id="l1">表单</label><br>
<input type="text" id="name" maxlength="10"/>
<p><label for="comments">我要留言:</label>
</p>
<input name="comments" id="comments" type="text" maxlength="10" />
</form>
</body>
</html>
请知道为什么第二种方法为什么在FF中报错的高手给说说应该如何改,明白后立即给分,谢谢
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title></title>
<script language="javascript" type="text/javascript">
function lessThan(e) {
if (!e) e = window.event;
var element = typeof event != "undefined" ? event.srcElement : e.target;
document.title = e.keyCode | e.which | e.charCode;
switch (e.keyCode | e.which | e.charCode) {
case 9: // table
case 8: // backspace
case 46: // delete
case 35: case 36: case 37: case 38: case 39: case 40: // home、end、left、up、right、down
case 116: // f5
return true; /* */
}
return element.value.length < element.getAttribute("maxlength");
}
</script>
</head><body>
<form>
<label id="l1">表单</label><br>
<input type="text" id="name" maxlength="10"/>
<p><label for="comments">我要留言:</label>
</p>
<input name="comments" id="comments" type="text" maxlength="10" onkeypress="return lessThan(event);"/>
</form>
</body>
</html>
但是在把上面的代码改写成这样时就FF就报错了
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title></title>
<script language="javascript" type="text/javascript">window.onload=function()
{
var _c=document.getElementById("comments");_c.onkeypress=function()
{
return lessThan(event);
}
}
function lessThan(e) {
if (!e) e = window.event;
var element = typeof event != "undefined" ? event.srcElement : e.target;
document.title = e.keyCode | e.which | e.charCode;
switch (e.keyCode | e.which | e.charCode) {
case 9: // table
case 8: // backspace
case 46: // delete
case 35: case 36: case 37: case 38: case 39: case 40: // home、end、left、up、right、down
case 116: // f5
return true; /* */
}
return element.value.length < element.getAttribute("maxlength");
}
</script>
</head><body>
<form>
<label id="l1">表单</label><br>
<input type="text" id="name" maxlength="10"/>
<p><label for="comments">我要留言:</label>
</p>
<input name="comments" id="comments" type="text" maxlength="10" />
</form>
</body>
</html>
请知道为什么第二种方法为什么在FF中报错的高手给说说应该如何改,明白后立即给分,谢谢
event is not defined
[Break on this error] return lessThan(event);我很是不明白,请高手给说说,明白立即给分,
_c.onkeypress=function(event)
{
return lessThan(event);
}