JAVAScript中，有一个textarea中比如输入AAA;BBB;CCC;DDD;当鼠标移动到这个字符上时；
比如鼠标现在在AAA;在AAA;上时，鼠标指针本来是那种像大写 I 这种的要输入的指针，但是现在要判断这个字符串是否有分号结尾，如有的话，那么鼠标点击到这个字符串时，变为那个全选的图标，应该是默认。求解。 JavaScript 鼠标 指针
[解决办法]
<textarea rows="6" id="txtBox" cols="60" onclick ="ShowFos()">
AAAAAAAAAAAAAA;BBBBBBBBBBBBBBBBBBBBBBBBBBBB;CCCCCCCCCCCCCCCCCCCCCCCCCCC;DDDDDDDDDDDDDDDDDDDDDDDDDD;
</textarea>
<script type="text/javascript">
function ShowFos() {
var obj = document.getElementById("txtBox");
var val = document.getElementById("txtBox").value;
var t1 = val.substr(0, getCursorPosition(obj).start);
var t2 = val.substr(getCursorPosition(obj).start, val.length);
var start = t1.length - (t1.length - t1.lastIndexOf(";"));
end = t1.length + t2.indexOf(";");
if (end > 0) {
obj.style.cursor = "pointer";
if (obj.setSelectionRange) {
obj.setSelectionRange(start,end);
} else {
var range = obj.createTextRange();
range.collapse(true);
range.moveStart('character', start);
range.moveEnd('character', end-start);
range.select();
}
}
else {
obj.style.cursor = "inherit";
}
}
function getCursorPosition(textarea) {
var rangeData = { text: "", start: 0, end: 0 };
textarea.focus();
if (textarea.setSelectionRange) { // W3C
rangeData.start = textarea.selectionStart;
rangeData.end = textarea.selectionEnd;
rangeData.text = (rangeData.start != rangeData.end) ? textarea.value.substring(rangeData.start, rangeData.end) : "";
} else if (document.selection) { // IE
var i,
oS = document.selection.createRange(),
// Don't: oR = textarea.createTextRange()
oR = document.body.createTextRange();
oR.moveToElementText(textarea);
rangeData.text = oS.text;
rangeData.bookmark = oS.getBookmark();
// object.moveStart(sUnit [, iCount])
// Return Value: Integer that returns the number of units moved.
for (i = 0; oR.compareEndPoints('StartToStart', oS) < 0 && oS.moveStart("character", -1) !== 0; i++) {
// Why? You can alert(textarea.value.length)
if (textarea.value.charAt(i) == '\n') {
i++;
}
}
rangeData.start = i;
rangeData.end = rangeData.text.length + rangeData.start;
}
return rangeData;
}
</script>
