练习

var b = “12”-Boolean(“”)+true+1;
var c = “10”+1-Boolean(“good”)+””;
var d = “1”+true-false;
var f = 10-“”+Boolean(“good”)-Boolean(“world”);
var g = “10”-Boolean(“ “)+”1”-true;

var a = “10”;
var b = true;
var c = 1;
console.log(a+c-b);
console.log(a-c+b);

var a =”21”;
var b = 4;
console.log(a+b-true+”3”); //2133
console.log(a-b+true-“false”); //2133
/
18-“false”
18-Number(“false”)
18-NaN
Tips:NaN和任何值计算,结果一定是NaN
/
var c = “false”;
console.log(a-b+Boolean(c));

    var a = "10";<br />        var b = true;<br />        var c = 1;<br />        console.log(a+b+c);  //1011<br />        /* "10true1" */<br />        console.log(a+c-b);//100<br />        /* 100 */
    console.log("9"-8+"false") //"1false"
    console.log("9"-true-"false"); //NaN<br />        console.log("10"-true+"hello");//9hello<br />        console.log(""-"9"+true-12); //  -20<br />        var a = 10;<br />        var b = "true";<br />        var c = "5";<br />        var sum = a++ -c+b;<br />        /* <br />        5+"true";<br />         */<br />        console.log(sum); //5true<br />        console.log(++a-c-b); // <br />        console.log(1-10*"5"+true); //-48<br />        console.log((2-"6")*3-false+true); <br />        /* <br />        -11<br />         */