要完成此效果需要两个步骤
第一步：把如下代码加入到<head>区域中
<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function CountWords (this_field, alertWords, alertChars) {
if (alertWords == null) {
alertWords = true;
}
if (alertChars == null) {
alertChars = false;
}
var fullStr = this_field.value;
var charCount = fullStr.length;
var rExp = /[^A-Za-z0-9]/gi;
var spacesStr = fullStr.replace(rExp, " ");
var cleanedStr = spacesStr + " ";
do {
var old_str = cleanedStr;
cleanedStr = cleanedStr.replace(" ", " ");
} while(old_str != cleanedStr);
var splitString = cleanedStr.split(" ");
var wordCount = splitString.length -1;
if (fullStr.length <1) {
wordCount = 0;
}
if (wordCount == 1) {
wordOrWords = " 个单词";
}
else {
wordOrWords = " 个单词";
}
if (charCount == 1) {
charOrChars = " 个字符";
} else {
charOrChars = " 个字符";
}
if (alertWords & alertChars) {
alert ("统计结果:\n" + " " + wordCount + wordOrWords + "\n" + " " + charCount + charOrChars);
}
else {
if (alertWords) {
alert ("Word Count: " + wordCount + wordOrWords);
}
else {
if (alertChars) {
alert ("Character Count: " + charCount + charOrChars);
}
}
}
return wordCount;
}
// End -->
</script>
第二步：把如下代码加入到<body>区域中
<form>
<textarea cols=40 rows=5 name=x>
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