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test.html
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test.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--<link rel="stylesheet" href="../css/style.css">-->
<title>任务一：表单（一）单个表单项的检验</title>
<style>
*{
margin:0;padding:0;
box-sizing: border-box;
}
:after, :before {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
body {
font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
font-size: 14px;
line-height: 1.42857143;
color: #333;
background-color: #fff;
}
.clearfix { clear: both;}
.spac4{
margin:10px;
}
.container{
width:500px;height:120px; border:1px solid #eee; position: absolute;margin:auto;top:0;left:0;right:0;bottom:0;margin:auto;
}
.form-group {
margin-right: -15px;
margin-left: -15px;
margin-bottom: 15px;
margin-top:15px;
}
.form-group:after{
display: table;
content: " ";
clear: both;
}
.text-right{
text-align: right;
}
.text-left{
text-align: left;
}
.text-center{
text-align: center;
}
.fl_left{
float: left;
}
.fl_right{
float: right;
}
.form-group .control-label {
padding-top: 7px;
margin-bottom: 0;
text-align: right;
}
#prompt{
display:block;
width:100%;
text-align: center;
margin-top:15px;
line-height:45px;
color:#AAAAAA;
}
.prompt{
width:100%;
text-align: center;
margin-top:15px;
line-height:45px;
color:#AAAAAA;
display:none;
}
.col-md-1,.col-md-2,.col-md-3,.col-md-4,.col-md-5,.col-md-6,.col-md-7,.col-md-8,.col-md-9,.col-md-10,.col-md-11,.col-md-12{
float: left;
padding-right: 15px;
padding-left: 15px;
}
.col-md-1{width:8.33333%}
.col-md-2{width:16.66667%}
.col-md-3{width:25%!important;}
.col-md-4{width:33.33333%}
.col-md-5{width:41.66667%}
.col-md-6{width:50%}
.col-md-7{width:58.33333%}
.col-md-8{width:66.66667%}
.col-md-9{width:75%}
.col-md-10{width:83.33333%}
.col-md-11{width:91.66667%}
.col-md-12{width:100%}
button, input, select, textarea {
font-family: inherit;
font-size: inherit;
line-height: inherit;
}
.form-control {
display: block;
width: 100%;
height: 34px;
padding: 6px 12px;
font-size: 14px;
line-height: 1.42857143;
color: #555;
background-color: #fff;
background-image: none;
border: 1px solid #ccc;
border-radius: 4px;
-webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075);
box-shadow: inset 0 1px 1px rgba(0,0,0,.075);
-webkit-transition: border-color ease-in-out .15s,-webkit-box-shadow ease-in-out .15s;
-o-transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
}
.btn {
display: inline-block;
padding: 6px 12px;
margin-bottom: 0;
font-size: 14px;
font-weight: 400;
line-height: 1.42857143;
text-align: center;
white-space: nowrap;
vertical-align: middle;
-ms-touch-action: manipulation;
touch-action: manipulation;
cursor: pointer;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
background-image: none;
border: 1px solid transparent;
border-radius: 4px;
}
.error{
border: 1px solid red;
}
.btn-primary {
color: #fff;
background-color: #337ab7;
border-color: #2e6da4;
}
</style>
</head>
<body>
<div style="font-size: 30px;font-weight: bold;margin-top:200px;text-align: center">任务一：表单（一）单个表单项的检验</div>
<div class="container">
<form action="">
<div class="form-group">
<label for="inputname" class="col-md-3 control-label">名称</label>
<div class="col-md-6">
<input type="text" class="form-control" id="inputname" placeholder="name">
</div>
<div class="col-md-3">
<button type="button" class="btn btn-primary" id="button">验证</button>
</div>
<p id="prompt">必填，长度为4~16个字符</p>
</div>
</form>
</div>
</body>
<script>
//获取的ID值
var input_name = document.getElementById("inputname");
var Btn = document.getElementById("button");
var promptLabel = document.getElementById("prompt");
//规则
var RegYchinese = /[\u4E00-\u9FA5]/g;//汉字
var regNchinese = /[^\u4E00-\u9FA5\uf900-\ufa2d]/g; //匹配非中文
var Regtrim = /^\s+|\s+$/g; // 删除字符串两侧的空白字符
Btn.addEventListener("click",function(){
var input_value = input_name.value;
//计算长度
var length = input_value.replace(Regtrim,'').replace(RegYchinese, '').length + input_value.replace(Regtrim,'').replace(regNchinese,'').length;
if(length==0){
input_name.style.border="1px solid red";
promptLabel.innerHTML= '名称不能为空';
promptLabel.style.color = "#DE0012";
}else if(length>=4&&length<=16){
input_name.style.border="1px solid green";
promptLabel.innerHTML= '名称格式正确';
promptLabel.style.color = "green";
}else{
input_name.style.border="1px solid red";
promptLabel.innerHTML= '必填，长度为4~16个字符';
promptLabel.style.color = "#DE0012";
}
})
</script>
</html>