动态检查条件使用数组：jQuery或Javascript

Question

This is static condition

var as = $(json).filter(function (i, n) {
    return n.website === 'yahoo' || n.website === 'ebay'
});

but want to check dynamically suppose my array value is

weblist[0] = "yahoo";
weblist[1] = "google";
weblist[2] = "ebay";
weblist[3] = "rediff";
weblist[4] = "amazon";

I want to check condition using above array value something like this

var as = $(json).filter(function (i, n) {
    return n.website === 'yahoo' || n.website === 'google' || n.website === 'ebay' || n.website === 'rediff' || n.website === 'amazon'
});

how can possible ?

Answer 1

You can use Array.prototype.indexOf() on the weblist to filter elements that are in the array weblist

var as=$(json).filter(function (i,n){
     return weblist.indexOf(n.website) !== -1
});

Polyfill

indexOf was added to the ECMA-262 standard in the 5th edition; as such it may not be present in all browsers. You can work around this by utilizing the following code at the beginning of your scripts. This will allow you to use indexOf when there is still no native support. This algorithm matches the one specified in ECMA-262, 5th edition, assuming TypeError and Math.abs have their original values.

Edit

You can also try using jQuery funciton jQuery.inArray() for better cross browser / version compatibility.

Answer 2

var as = $(json).filter(function (i,n){
    return $.inArray(n.website, weblist) >= 0;
});