关于&&和||
关于&&和||
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var a=3
var b=2
var c=a && b; //a如果对就返回b,a如果错就直接返回a ,有顺序,先左后右
var c=a || b; //左右两边返回对的值; 从左到右,是对的就返回哪个值
console.log(c);
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