如何将这个简短的PHP函数转换为Javascript? [英] How can I convert this short PHP function into Javascript?
问题描述
如何将此PHP代码复制到Javascript中?它需要一个像2-9999(序列号)的数字并将其转换为NUMBER ...转换时,2-999将是一个不同的值。
How can I replicate this PHP code into Javascript ?? It takes a number like 2-9999 (serial number) and converts it into a NUMBER ... 2-999 would be a different value when converted.
function esn_to_num($esn)
{
if (($tmp = explode('-', $esn))) {
if (sizeof($tmp) == 2
&& my_isnum($tmp[0])
&& my_isnum($tmp[1])
) {
$esn = (($tmp[0] << 23) | $tmp[1]);
} else {
$esn = -1;
}
} else {
$esn = -1;
}
return $esn;
}
我在下面添加了一个依赖函数
I added a dependency function below
// dependency function
/*****************************************************************************
* CHECKS IF A STRING REPRESENTS A NUMBER
******************************************************************************/
function my_isnum($str, $negative=false, $decimal=false)
{
$has_decimal = false;
$len = strlen($str);
if ($len > 0) {
$valid = true;
for ($i=0; $valid && $i<$len; $i++) {
if (!($str[$i] >= '0' && $str[$i] <= '9')) {
if ($str[$i] == '-') {
if (!$negative || $i != 0) {
$valid = false;
}
} else if ($str[$i] == '.') {
if (!$decimal || $has_decimal) {
$valid = false;
}
} else {
$valid = false;
}
}
}
} else {
$valid = false;
}
return $valid;
}
推荐答案
php语法非常类似于JS。
php syntax is pretty similar to JS.
只需获取变量并删除 $
,并使用声明它们var
关键字。
Just take the variables and remove the $
, and declare them with the var
keyword.
function esn_to_num(esn) {
var tmp = [];
if ((tmp = explode('-', $esn))) {
if (sizeof(tmp) == 2
&& my_isnum(tmp[0])
&& my_isnum(tmp[1])
) {
esn = ((tmp[0] << 23) | tmp[1]);
} else {
esn = -1;
}
} else {
esn = -1;
}
return esn;
}
然后你需要用等效的JS替换所有的php函数。查找javascript等价爆炸
, sizeof
。
Then you need to replace all your php functions with equivalent JS ones. Look up "javascript equivalents of explode
, sizeof
.
按照相同的过程在javascript中重写 my_isnum
(显然不是原生的php函数)。
Follow the same process to rewrite my_isnum
in javascript (clearly not a native php function).
编辑:在看到你的更新之后,我意识到Stack Overflow(或其他地方)可能已经存在很多代码,这些代码将是 my_isnum
所做的。 js函数确定字符串是否为数字或在此处单独询问。
edit: after seeing your update, I realize there is probably already a good chunk of code on Stack Overflow (or elsewhere) which will what my_isnum
does. Either search "js function to determine if string is number" or ask that in a seperate question here.
您可以在chromes javascript控制台中完成所有这些操作,并继续迭代直到停止如果你遇到一个特定的问题并且卡住了,那么在Stack Overflow上提出这个问题是个好点。
You can do all this in chromes javascript console, and keep iterating until you stop getting errors. If you run into a specific problem and are stuck, thats a good point to ask about it on Stack Overflow.
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