这是我的 HTML 代码：<select id="stand" onchange="myFun2()"> <option value="platinumGallery">Platinum Gallery</option> <option value="superHospitalityStand">Super Hospitality Stand</option> <option value="northWestStand">North West Stand</option> <option value="eastStand">East Stand</option></select><br><br><label>Cost Of Ticket: </label><input id="costOfTicket" type="text" readonly>和JS代码：function myFun2(){ var costOfTicket; var selectedStand = document.getElementById("stand").value; if(selectedStand = "platinumGallery"){ costOfTicket = 25000; } else if(selectedStand = "superHospitalityStand"){ costOfTicket = 20000; } document.getElementById("costOfTicket").value = costOfTicket;}每当onchange()事件发生时，我想Cost Of Ticket根据选择的值进行显示select。但它会在事件发生25000后显示onchange()，然后无论选择的值如何都不会改变。如何修正代码来完成上述任务？
2 回答
尚方宝剑之说
TA贡献1788条经验 获得超4个赞
让我告诉你。在 if-else 语句中，您不是在比较值，而是实际上是在分配值。
因此，将 if-else 语句更改为：
if(selectedStand == "platinumGallery"){
costOfTicket = 25000;
}
else if(selectedStand == "superHospitalityStand"){
costOfTicket = 20000;
}
慕侠2389804
TA贡献1719条经验 获得超6个赞
您在声明=中使用了if。您需要在`if 语句中使用==or===来使其作为条件起作用。
function myFun2(){
var costOfTicket;
var selectedStand = document.getElementById("stand").value;
if(selectedStand == "platinumGallery"){
costOfTicket = 25000;
}
else if(selectedStand == "superHospitalityStand"){
costOfTicket = 20000;
}
document.getElementById("costOfTicket").value = costOfTicket;
}
<select id="stand" onchange="myFun2()">
<option value="platinumGallery">Platinum Gallery</option>
<option value="superHospitalityStand">Super Hospitality Stand</option>
<option value="northWestStand">North West Stand</option>
<option value="eastStand">East Stand</option>
</select><br><br>
<label>Cost Of Ticket: </label>
<input id="costOfTicket" type="text" readonly>
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