<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
</body>
<script>
//一元加和减操作符
var s1='01';
var s2='1.1';
var s3='z';
var b=false;
var f=1.1;
var o={
valueOf:function(){
return -1;
}
};
s1=-s1;
console.log(s1);//-1
o=-o;
console.log(o);//1
console.log(-b);//0
console.log(-s3);//NAN
console.log(-f);//-1.1
console.log(-s2);//-1.1
//按位非:返回数值的反码；
//本质：操作数的负值减1
var num1=25;
var num2=~num1;
console.log(num2);//-26
//相当于
var num1=25;
var num2=-num1-1;
console.log(num2);//-26
</script>
</html>
代码持续更新中。。。