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bstartsWith函数主要是用来判断一个 b1 是否由 b2 开头，返回 bool 类型结果。与 startsWith 不同的是，bcontains 是字节流（bytes）的查找
func (b1 bytes) bstartsWith(b2 bytes) bool
| 参数名称 | 参数介绍 |
|---|---|
| b1 | 被匹配的数据 |
| b2 | 要匹配的数据 |
HTTP/1.1 200 OK
Server: nginx
Date: Sat, 07 Jan 2023 10:41:06 GMT
Content-Type: text/html; charset=utf-8
Connection: close
Vary: Accept-Encoding
Cache-Control: no-cache
Content-Length: 2180
<!DOCTYPE html>
<html>
<head>
<title>abc123</title>
</head>
<body>
asd123
ABC124
</body>
</html>
response.body.bstartsWith(b"<!DOCTYPE")
true
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