<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
</body>
</html>
<script type="text/javascript">
var str1 = "abc哈哈呵呵123你好";
var s1 = str1.substr(3, 4);
console.log(s1);
var index = str1.indexOf("呵");
console.log(index);
var s2 = str1.replace("哈哈", " hello");
console.log(s2);
var str2 = " a b c ";
var s3 = str2.trim();
console.log(str2);
console.log(s3);
var str3 = "哈,呵呵,你好,哎呀,吃饭啦";
var arr = str3.split(",");
console.log(arr);
str3 = "哈 呵呵 ac sn";
console.log(str3.split(" "));
str3 = "你好,呵呵 哈哈 abc,bvc";
console.log(str3.split(/ |,/));
str3 = "abcdfhg,哈哈 呵呵";
console.log(str3.split(""));
</script>
