JQuery两个if语句

Question

我有一张关于城市的信息表。当温度低于32且高程大于1000时，我试图得到一个图像（在div内）。

我的陈述不断出现错误。

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

Answer 1

这是一个非常破碎的结构：

$("td.condition").each(function(){
    if($("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()

如果对.show()的调用应该在if块内，那么你想把它放在if之后的大括号块中：

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