js 中三元运算符的运用

外层为false，逐级向内层判断

$scope.nums=700;
$scope.result=($scope.nums>300)?($scope.nums>400)?($scope.nums>500)?($scope.nums>600)?'飞机':'高铁':'汽车':'客车':'无';
console.log($scope.result);

运算符的简单使用小例子（开关按钮效果）

一、页面结构

<div id="div1" class="open1">
<div id="div2" class="open2"></div>
</div>

二、样式

#div1{
width: 170px;
height: 100px;
border-radius: 50px;
position: relative;
}
#div2{
width: 96px;
height: 96px;
border-radius: 48px;
position: absolute;
background: white;
box-shadow: 0px 2px 4px rgba(0,0,0,0.4);
}
.open1{
background: rgba(0,184,0,0.8);
}
.open2{
top: 1px;
right:0px;
}
.close1{
background: rgba(255,255,255,0.4);
border:3px solid rgba(0,0,0,0.15);
border-left: transparent;
}
.close2{
left: 0px;
top: 0px;
border:2px solid rgba(0,0,0,0.1);
}

三、事件方法

window.onload=function(){
var div2=document.getElementById("div2");
var div1=document.getElementById("div1");
div2.onclick=function(){
div1.className=(div1.className=="close1")?"open1":"close1";
div2.className=(div2.className=="close2")?"open2":"close2";
}
}