javascript - jQuery追加如果定义

Question

仅当电话存在时我将如何进行此附加，如果电话不存在则跳过

for (var i in data.businesses) {
    $('body').append( "<p>" + data.businesses[i].telephone + "</p>");
}

Answer 1

尝试

$.each(data.businesses, function(index, business){
    if(business.telephone){
        $('body').append( "<p>" + business.telephone + "</p>");
    }
});

Answer 2

for (var i in data.businesses) {
    if(data.businesses[i].telephone)
        $('body').append( "<p>" + data.businesses[i].telephone + "</p>");
 }

Answer 3

尝试这个：

for (var i in data.businesses) {
    if(data.businesses[i].telephone  !== null and data.businesses[i].telephone !== undefined) {
        $('body').append( "<p>" + data.businesses[i].telephone + "</p>");
    }
}