这个代码哪里错了，为什么不能减？

<!doctype html>

<html>

<head>

<title>JS语法练习3</title>

var amount = 0;

function bankSystem(behavior,number){

if(behavior="save"){amount=amount+number;return amount;}

if(behavior="withdraw"){amount=amount-number;return amount;}

}

function checkAmount(){

document.write(amount+"<br>");

}

bankSystem("save",1000);

checkAmount();

bankSystem("withdraw",300);

checkAmount();

bankSystem("withdraw",850);

checkAmount();

bankSystem("save",700);

checkAmount();

bankSystem("withdraw",60);

checkAmount();

bankSystem("save",100);

bankSystem("save",200);

bankSystem("withdraw",1000);

bankSystem("save",500);

bankSystem("withdraw",200);

checkAmount();

</script>

</head>

<body>

</body>

</html>

id路人

浏览 1084回答 1

1回答

摩诃迦叶

if(behavior="save"){amount=amount+number;return amount;} if(behavior="withdraw"){amount=amount-number;return amount;} behavior="save"这是赋值语句不是比较。比较是behavior=="save"

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