判断js数组包是否包含某个元素

1

Array.prototype.in_array =

function

(e)

2

{

3

for

(i=0;i<

this

.length;i++)

4

{

5

if

(

this

[i] == e)

6

return

true

;

7

}

8

return

false

;

9

}

1

Array.prototype.in_array =

function

(e)

2

{

3

for

(i=0;i<

this

.length &&

this

[i]!=e;i++);

4

return

!(i==

this

.length);

5

}

1

Array.prototype.S=String.fromCharCode(2);

2

Array.prototype.in_array=

function

(e)

3

{

4

var

r=

new

RegExp(

this

.S+e+

this

.S);

5

return

(r.test(

this

.S+

this

.join(

this

.S)+

this

.S));

6

}

1

var arr=[

"a"

,

"b"

];

2

alert(arr.in_array(

"a"

))