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ife_task_3.1.html
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ife_task_3.1.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>task 3.1</title>
<style type="text/css">
body{font: bold 14px/30px Microsoft Yahei;}
#tip{margin-left: 40px; font-weight: normal; color: grey;}
.blank1{border: solid 1px red;}
.blank2{color: red;}
.correct1{border: solid 1px green;}
.correct2{color: green;}
.wrong1{border: solid 1px grey;}
.wrong1{color: grey;}
</style>
</head>
<body>
<label>名称</label>
<input type="" name="" id="nameInput">
<button id="nameBtn">验证</button>
<div id="tip">必填，长度为4~16个字符</div>
<script type="text/javascript">
var nameInput = document.getElementById('nameInput');
var nameBtn = document.getElementById('nameBtn');
var tip = document.getElementById('tip');
nameBtn.onclick = function () {
var inputValue = nameInput.value;
if ( !inputValue){
nameInput.className = 'blank1';
tip.className = 'blank2';
tip.innerHTML = '姓名不能为空';
}
else {
var length;
if ( /[^\x00-\xff]/g.exec(inputValue) ){
length = inputValue.length + inputValue.match(/[^\x00-\xff]/g).length;
}
else {
length = inputValue.length;
}
if ( length >= 4 && length <= 16) {
nameInput.className = 'correct1';
tip.className = 'correct2';
tip.innerHTML = '名称格式正确';
}
else {
nameInput.className = 'wrong1';
tip.className = 'wrong2';
tip.innerHTML = '必填，长度为4~16个字符';
}
}
}
</script>
</body>
</html>