JavaScript字符串对象的concat方法实例（用于连接两个或多个字符串）

str_object.concat(str1, str2, ...)

<script language="JavaScript">
var str = "www";
var str1 = ".";
var str2 = "jb51";
var str3 = ".";
var str4 = "net";
document.write( str.concat(str1, str2, str3, str4) );
</script>