var locationHint = '城市、州、國家/地區、郵遞區號';

function locationFocus(elem, focus_gained) {
    if (focus_gained) {
        if (elem.value != '' && elem.value == "城市、州、國家/地區、郵遞區號") {
            elem.value = "";
        }
    } else {
        if (elem.value == "") {
            elem.value = "城市、州、國家/地區、郵遞區號";
        }
    }
}