PHP's array function in_array() is very convenient, but JS is not. Actually I don’t like JS arrays~
Stop talking, just go straight to the method
Copy the 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 the 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. In fact, it’s just the same form, just written in different ways.
Of course, there is another method that I recommend more,
Copy the 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 better. It doesn’t matter if you don’t understand it. You can just use the code I wrote. Quack. .
Just check it with simulated data
Copy the code code as follows:
var aa = new Array(1,2,'aa','bbb',4,5);
alert(aa.in_array(3));
alert(aa.in_array('aa'));