var a = 20;
var b = --a + 2;
console.log(a);//19
console.log(b);//21先执行减法操作再赋值
var a = 20;
var b = a-- + 2;
console.log(a);//19
console.log(b);//22先赋值再执行减法操作
var a = 20;
var b = --a + 2;
console.log(a);//19
console.log(b);//21先执行减法操作再赋值
var a = 20;
var b = a-- + 2;
console.log(a);//19
console.log(b);//22先赋值再执行减法操作
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