<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="text" placeholder="请输入字符" id="input1">
<button id="button1">统计</button>
<div id="box1"></div>
<script type="text/javascript">
var btn = document.getElementById('button1'),
box = document.getElementById('box1');
btn.onclick = function() {
var str = document.getElementById('input1').value,
countChinese = 0,
countUpper = 0,
countLower = 0,
countNumber = 0,
countOther = 0;
/* 遍历字符串中的每个字符 */
for (var i = 0, len = str.length; i < len; i++) {
var char = str.charAt(i);
if (/[\u4e00-\u9fa5]/.test(char)) {
countChinese++;
} else if (/[A-Z]/.test(char)) {
countUpper++;
} else if (/[a-z]/.test(char)) {
countLower++;
} else if (/[0-9]/.test(char)) {
countNumber++;
} else {
countOther++;
}
}
box.innerHTML = '字符串: <b>' + str + '</b> 中含有: <br />汉字个数: ' + countChinese + '<br />大写字母个数: ' + countUpper + '<br />小写字母个数: ' + countLower + '<br />数字: ' + countNumber + '<br />其他字符: ' + countOther
}
</script>
</body>
</html>
结果如下图：
image.png
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