我想将多个变量的快捷方法合并为一个语句，如
if（a，b，c === undefined）
{a，b，c =im not defined}
else {a，b，c =im defined};
我尝试过：
var a = 1;
var b =1;
var c =;
var d;
if（a === undefined）
{a =im not defined;}
else {a =im defined;};
if（b === undefined）
{b =im not defined;}
else {b =im defined;};
if（c === undefined）
{c =im not defined;}
else {c =im defined;};
if（d === undefined）
{d =我未定义;}
else {d =im defined;};
document.write（a +
+ b +
+ c +
+ d）;
/ *我想要快捷方法* /
i want a shortcut method for multiple variable into one statement like
if (a,b,c ===undefined)
{ a,b,c = "i m not defined"}
else {a,b,c = "i m defined"};
What I have tried:
var a = 1;
var b = "1";
var c = "";
var d;
if (a === undefined)
{a = "i m not defined";}
else {a = "i m defined";};
if (b === undefined)
{b = "i m not defined";}
else {b = "i m defined";};
if (c === undefined)
{c = "i m not defined";}
else {c = "i m defined";};
if (d === undefined)
{d = "i m not defined";}
else {d = "i m defined";};
document.write(a+"
"+b+"
"+c +"
"+d);
/* i want shortcut method for it */
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