web.whatsapp.com phone number extractor

phone_number_extractor.js

function download(data, filename, type) {
    var file = new Blob([data], {type: type});
    if (window.navigator.msSaveOrOpenBlob)
        window.navigator.msSaveOrOpenBlob(file, filename);
    else {
        var a = document.createElement("a"),
                url = URL.createObjectURL(file);
        a.href = url;
        a.download = filename;
        document.body.appendChild(a);
        a.click();
        setTimeout(function() {
            document.body.removeChild(a);
            window.URL.revokeObjectURL(url);  
        }, 0); 
    }
}

var items = document.querySelectorAll('div.infinite-list-item');

var phone_numbers = [];
for (var i = 0; i < items.length; i++){
	var item = items[i];
	var src = item.querySelector('div.avatar-body > img').src;
	if (src.indexOf('https') > -1)
	{
		var pieces = src.split('&');
		var pieces_2 = pieces[1].split('=');
		var number = pieces_2[1];
		number = number.substring(0, number.length - 7);
		phone_numbers.push(number);
	}
}

download(phone_numbers.join("\r\n"), 'whatsapp_phone_numbers.txt', 'text');