JQuery兩個if語句

Question

我有一張關於城市的信息表。我試圖在溫度低於32並且海拔高於1000時顯示圖像（在div內）。

我的聲明不斷出現錯誤。

$("td.condition").each(function(){ 
    if($("td.elevation").text() > 1000) && ($("td.high_temp").text() < 32)));  
    } 
    $(".ice").show(); 
}); 

Answer 1

這是一個很破的結構：

$("td.condition").each(function(){ 
    if($("td.elevation").text() > 1000) && ($("td.high_temp").text() < 32))); 
    // The above is an empty "if" because of the semi-colon after it. 
    // So it checks the condition, but then doesn't do anything. 
} 
// Now the anonymous function is closed. 
$(".ice").show(); 
// Which means the above line of code is trying to be passed as an argument to each(), which doesn't make sense. 
}); 
// Then you have a stray } and then close the call to each() 

如果以.show()該呼叫被認爲是if塊內，那麼你要放在一個大括號塊以下的if ：

$("td.condition").each(function(){ 
    if($("td.elevation").text() > 1000) && ($("td.high_temp").text() < 32))) { 
     $(".ice").show(); 
    } 
});