如果语句和条件

Question

我想在alert框中确认两个不同的事情，如果语句。首先是用户按下了“是”按钮，第二个是用户在页面上的输入值。请参阅下面的代码。我仍然非常绿色，任何帮助将不胜感激。

var cMsg = "You are about to reset this page!"; 
cMsg += "\n\nDo you want to continue?"; 

var nRtn = app.alert(cMsg,2,2,"Question Alert Box"); 
if(nRtn == 4) && (getField("MV").value == 5) 
{ 
////// do this 

} 
else if(nRtn == 4) && (getField("MV").value == 6) 
{ 
/////then do this 
} 
else if(nRtn == 4) && (getField("MV").value == 7) 
{ 
/////then do this 
} 

} 
else if(nRtn == 3) 
{ 
console.println("Abort the submit operation"); 
} 
else 
{ //Unknown Response 
console.println("The Response Was somthing other than Yes/No: " + nRtn); 
} 

Answer 1

您的if...else语法不正确。正确的语法

if (condition) 
    statement1 
[else 
    statement2] 

使用正确的语法

if (nRtn == 4 && getField("MV").value == 5) { 
    ////// do this  
} else if (nRtn == 4 && getField("MV").value == 6) { 
    /////then do this 
} else if (nRtn == 4 && getField("MV").value == 7) { 
    /////then do this 
} else if (nRtn == 3) { 
    console.println("Abort the submit operation"); 
} else { //Unknown Response 
    console.println("The Response Was somthing other than Yes/No: " + nRtn); 
} 

而不是

if (nRtn == 4) && (getField("MV").value == 5) { 
    ////// do this 

} else if (nRtn == 4) && (getField("MV").value == 6) { 
    /////then do this 
} else if (nRtn == 4) && (getField("MV").value == 7) { 
    /////then do this 
} <=== Remove this 

} else if (nRtn == 3) { 
    console.println("Abort the submit operation"); 
} else { //Unknown Response 
    console.println("The Response Was somthing other than Yes/No: " + nRtn); 
} 

Answer 2

你试图评估两种不同的条件是： “NRTN” //值从app.alert返回（cMsg，2,2，“问题提示框”）; ： 和：getField（“MV”）.value。

但是，编译器将只处理第一个条件，因为大括号在那里结束。您应该确保将大括号内的所有条件都括起来。个别条件可以并且按照惯例也应该在主支架内分开的大括号中。 因此正确的方法应该是：

if ((nRtn == 4) && (getField("MV").value == 5)) 
//notice the initial if ((and terminating)) 
//You could have 3 conditions as follows 
// if (((condition1) && (condition2)) && (condition3))) 
{ 
////// do this 

} 
else if((nRtn == 4) && (getField("MV").value == 6)) 
{ 
/////then do this 
} 
else if((nRtn == 4) && (getField("MV").value == 7)) 
{ 
/////then do this 
} 

} 
else if(nRtn == 3) 
{ 
console.println("Abort the submit operation"); 
} 
else 
{ //Unknown Response 
console.println("The Response Was somthing other than Yes/No: " + nRtn); 
}