是否可以从javascript中的conditional（ternary）运算符获取两个值？

Question

Here I have the following javascript code, with the two values.

var w = $("#id1").val();
var h = $("#id2").val();  
(w == h) ? (w=350 , h=350):((w<h)?(w=300 , h=350):(w=350 , h=300)); 

Here i want to check the three conditions.

1) If w == h then we need to assign some values.  
2)else if w < h then we need to assign some other values.    
3)else if w > h then we need to assign some other values.  

above code is showing not giving the w and values showing javascript error, how to get those values with the ternary operator, with out using if and else conditions.
Please help me.

Thanks in advance

Answer 1

Yes, you can return an array (alternatively an object) from the conditional operator, and assign values from the array:

var values = w == h ? [350, 350] : w < h ? [300, 350] : [350, 300];
w = values[0];
h = values[1];

---

Your original code should actually work, it does when I test it. However, you are misusing the conditional operator. If you want to do the assignment directly and not return a value, you should not use the conditional operator, but just an if statement:

if (w == h) {
  w = 350; h = 350;
} else if (w < h) {
  w = 300; h = 350;
} else {
  w = 350; h = 300;
}

Answer 2

Another solution (which is longer) is by using closure and immediately executed function:

w == h ? function(){w = 350; h = 350}() : 
w < h ? function(){w = 300; h = 350}() : 
        function(){w = 350; h = 300}();