In_array function Customization Method of PHP-like JS array _javascript tips

PHP's Array function In_array () is very convenient, but JS is not. In fact, I do not like the JS array ~

Stop it, go directly to the method

Copy Code code as follows:

Array.prototype.in_array = function (e)
{
for (i=0;i<this.length;i++)
{
if (this[i] = = e)
return true;
}
return false;
}

Or

Copy Code code as follows:

Array.prototype.in_array = function (e)
{
For (i=0;i<this.length && this[i]!=e;i++);
Return! (I==this.length);
}

Both of these are possible. is actually a form, the writing is not the same.

Of course, there is another way I recommend it,

Copy Code code as follows:

Array.prototype.s=string.fromcharcode (2);
Array.prototype.in_array=function (e)
{
var r=new RegExp (this. S+e+this. S);
Return (R.test) (this. S+this.join (this. S) +this. S));
}

I personally like this, do not understand what is the relationship, you just use my code to write good, quack.

Analog data detection is good

Copy Code code as follows:

var aa = new Array (1,2, ' AA ', ' BBB ', 4,5);
Alert (Aa.in_array (3));
Alert (Aa.in_array (' AA '));