http://jishuziyuan.com/archive/shaenxing2/6341238.html
<script>
if(1 == true){
console.log('1.ture');
}else{
console.log('1.false');
}
if(1===true){
console.log('2.true');
}else{
console.log('2.false');
}
</script>
log结果:
2.false
实例
http://hi.baidu.com/songzongquan/item/67eaa5d8cd48bbf692a9747d
console.log(1&&2); //2
console.log(0&&2); //0
console.log(false&&2); //false
console.log(null&&2); //null
console.log('a'&&2); //2
console.log(1||2); //1
console.log(0||2); //2
//下面是一种情况
var a;
console.log(a&&2); //undefined
//下面是一种情况
console.log(a&&2); //报错 因为没有var a