字符统计与基本正则

统计字符个数：

<!DOCTYPE html>

<html lang="en">

<head>

<meta charset="UTF-8">

<meta name="viewport" content="width=device-width, initial-scale=1.0">

<meta http-equiv="X-UA-Compatible" content="ie=edge">

<title>Document</title>

</head>

<body>

<script>

var count = 0;

var stopposition = 0

var item = "stop"

var str = "start,stop,speed,start,stop,speed,start,stop,speed,start,stop,speed,"

while( stopposition < str.length ){

if( str.indexOf( item , stopposition) > 0 ){

count ++

stopposition = str.indexOf( item , stopposition)

stopposition += item.length ;

}else{

stopposition += str.length

}

}

console.log(str)

console.log( '个数为', count );

</script>

</body>

</html>

正则的基本表达：

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原文地址：https://www.cnblogs.com/curtain473/p/9852902.html