js常用方法demo
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>网页标题</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css"></style>
<script type="text/javascript">
//大写和小写方法
var str="javascript";
var str1="HTML";
document.write(str.toUpperCase()+"<br>");
document.write(str1.toLowerCase());
document.write("<hr>");
//分割后的数组
var week="星期一|星期二";
var arr=week.split("|");
document.write(arr);
document.write("<hr>");
//正则匹配
var str="hello世界,hello美女,hello帅哥";
//创建一个正则表达式
var reg=/hello/g;
document.write(str.replace(reg,"你好"));
document.write("<hr>");
//重新排序
var arr=["北京市","重庆市","福建市"];
document.write(arr.sort(sortby));
function sortby(c,d){
return c.localeCompare(d); //localeCompare()方法实现中文排序、sort方法实现数字英文混合排序
}
</script>
</head>
<body>
</body>
</html>
检验字符串是否含特殊符号demo
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>网页标题</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css"></style>
<script type="text/javascript">
//检验的字符串,自行修改
var username="qiu<qiongben";
var flag=checkUserName(username);
function checkUserName(user){
//特殊符号包含项,自行修改
var arr=['<','>','#','?','!'];
var user_length=user.length;
var arr_length=arr.length;
for(var i=0;i<user_length;i++){
for(var j=0;j<arr_length;j++){
if(user.charAt(i)==arr[j]){
return false;
}
}
}
return true;
}
if(flag){
document.write("合法");
}
else{
document.write("有特殊符号");
}
</script>
</head>
<body>
</body>
</html>
倒序截取字符串demo
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>网页标题</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css"></style>
<script type="text/javascript">
var str="javascript";
var len=str.length;
//数据结果(10-1)倒序字符串下标值
for(var i=str.length;i>0;i--){
document.write(str.charAt(i));//charAt将对应下标 输出结果:tpircsava
}
</script>
</head>
<body>
</body>
</html>
