为什么if(x>600&&x<0)会生效，而if(0<x<600)不会生效

Question

var x = -100
 if(0<x<600){
        console.log(x)
}
var x = -100
 if(0<x&&x<600){
        console.log(x)
}

Answer 1

http://baike.baidu.com/link?url=uzRGATqRR38jURl7dI3fuhhEWwvi1zzlQsEx0jYi5zoVBLIfAClRxeAfJkUBHMHNQdBPUfY5aORwruvEwNSVHj3SbLOQElFq3-BExldXNXDqB0H8B7ejCMQCT1BF6oWoQLLRujzT-6k0ZAV3JGo73K

运算符优先级。。。看完就明白了