三种条件表达的写法的特点及用处进行了总结归纳，简述如下：
1. if...else结构
// Set r to 0 or 1
var r= Math.floor(2*Math.random())
// Set a, b and c to "small" if r==0 an else set them to "big"
// using three different techniques
// Method 1: If else
var a; if (r==0){a = "small"} else {a = "big"};
// Method 2: Conditional operator
var b = r==0 ? "small" : "big";
// Method 3: And/or operators
var c = r==0 && "small" || "big";
// Check the values of our variables
alert(r+" "+a+" "+b+" "+c);2. if...else if...else结构
// Set r to 0,1,2 or 3
var r= Math.floor(4*Math.random())
// Set a, b and c to "nada","small","big" and "huge"
// depending on the value or r using three different techniques
// Method 1: If.. else if... else
var a;
if (r==0){a="nada"}
else if (r==1){a="small"}
else if (r==2){a="big"}
else {a="huge"};
// Method 2: Conditional operators
var b =
r==0 ? "nada"
: r==1 ? "small"
: r==2 ? "big"
: "huge";
// Method 3: And/or operators
var c =
r==0 && "nada"
|| r==1 && "small"
|| r==2 && "big"
|| "huge";
// Check the values of our variables
alert(r+" "+a+" "+b+" "+c);3. 执行函数
// Set r to 0,1,2 or 3
var r= Math.floor(4*Math.random())
// The global variable x and our four functions
var x="";
nada=function(){x+="Nada! "};
small=function(){x+="Small! "};
big=function(){x+="Big! "};
huge=function(){x+="Huge! "};
// Call a specific function depending on the value of r
// using three different techniques
// Method 1: If.. else if... else
if (r==0){nada()}
else if (r==1){small()}
else if (r==2){big()}
else {huge()};
// Method 2: Conditional operators
r==0 ? nada()
: r==1 ? small()
: r==2 ? big()
: huge();
// Method 3: And/or operators
r==0 && (nada() || true) //nada()函数不一定返回true，为了保证后续的逻辑或||判断不被执行，需要返回true值，下同
|| r==1 && (small() || true)
|| r==2 && (big() || true)
|| huge();
// Check the values of our variables
alert(r+" "+x);4. 执行代码
立即学习“Java免费学习笔记（深入）”；
// Set r to 0,1,2 or 3
var r= Math.floor(4*Math.random())
// The global variable x
var x="";
// Executing different code depending on the value of r
// using three different techniques
// Method 1: If.. else if... else
if (r==0){x+="Nada! "}
else if (r==1){x+="Small! "}
else if (r==2){x+="Big! "}
else {x+="Huge! "};
// Method 2: Conditional operators
r==0 ? function(){x+="Nada! "}()
: r==1 ? function(){x+="Small! "}()
: r==2 ? function(){x+="Big! "}()
: function(){x+="Huge! "}();
// Method 3: And/or operators
r==0 && (function(){x+="Nada! "}() || true)
//有人在评论中指出这里的匿名函数是不必需的，在只有一条可执行代码时是这样的，但是如果有多条代码需要执行，匿名函数还是不错的
|| r==1 && (function(){x+="Small! "}() || true)
|| r==2 && (function(){x+="Big! "}() || true)
|| function(){x+="Huge! "}();
// Check the values of our variables
alert(r+" "+x);在只存在两种条件的判断中，用if...else或?:都是相当直白，而&&和||的运算方式就稍嫌复杂。但是其实只要明白以下两个基本原则，所有问题都会迎刃而解了：
其一、当用逻辑与&&和逻辑或||运算符运算时，方向都是自左向右的，&&运算到第一个值为false的条件（或可转换为false的值，如null/undefined/0/""/NaN等）时停止，而运算到第一个值为true的条件（或可转换为true的值）时停止；整个条件返回的值是最后检测的条件的值，不一定只是true/false。
其二、逻辑与&&运算符较逻辑或运算符相比，前者有更高的优先级。
