检查数组键是否等于特定值JavaScript

Question

I have this array:

var arr = [
    ['First', 'lorem ipsum'],
    ['Second', 'dolor sit amet'],
];

and I want if arr[0] equals First do action 1, else do action 2.

I used:

for (var i = 0; i < markers.length; i++) {
    var arr = markers[i];
    var marker = new google.maps.Marker({
        map: map,
        if(arr[0] == 'Lorem') {
                icon: 'http://imgur.com/1.png',
                }
        else {
            icon: 'http://imgur.com/2.png',
            }
    });

    var contentString = '';

    google.maps.event.addListener(marker, "click", function () {
        infowindow.setContent(this.html);
        infowindow.open(map, this);
    });
}

but I get Uncaught SyntaxError: Unexpected token [.

How should I do this?

Answer 1

You can't use an if statement in an object literal. The code has several syntax errors.

You can define a variable that refers to the object and conditionally add the property to it:

var obj = {
   map: map
};

if ( condition ) {
   obj.icon = 'http://imgur.com/1.png';
} else {
   obj.icon = 'http://imgur.com/2.png';
}

var marker = new google.maps.Marker(obj);

Another option is using a ternary operator :

var marker = new google.maps.Marker({
    map: map,
    icon: arr[0] == 'Lorem' ? 'http://imgur.com/1.png' : 'http://imgur.com/2.png'
});