递增运算符练习（JS）

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    <title>递增运算符练习</title>
    <script>var a = 10;
        ++a; // ++a  11    a = 11
        var b = ++a + 2; // a = 12   ++a = 12
        console.log(b); // 14

        var c = 10;
        c++; // c++ 11  c = 11
        var d = c++ + 2; //  c++  = 11 先返回11  再自加1    c = 12
        console.log(d); // 13

        var e = 10;
        var f = e++ + ++e; // 1. e++ =  10     e = 11     2. e = 12  ++e = 12
        console.log(f); // 22
        // 后置自增  先表达式返回原值 后面变量再自加1</script>
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