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javascript不同类型数据之间运算的转换

2017-11-28 10:55 776 查看

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>javascript不同类型数据之间运算的转换</title>
</head>
<body>
<script type="text/javascript">
var result = null + 1;
console.log(result); //1

result = undefined + 1;
console.log(result); //NaN

result = false + 1;
console.log(result); //1

result = true + 1;
console.log(result); //2

result = '6' + 1;
console.log(result); //61

result = '6' - 1;
console.log(result); //5

result = 'a' + 1;
console.log(result); //a1

result = 'a' - 1;
console.log(result); //NaN

result = null + undefined;
console.log(result); //NaN

result = null + 'a';
console.log(result); //nulla

result = null - 'a';
console.log(result); //NaN

result = undefined + 'a';
console.log(result); //undefineda

result = undefined - 'a';
console.log(result); //NaN

result = true + 'a';
console.log(result); //truea

result = true - 'a';
console.log(result); //NaN

result = false + 'a';
console.log(result); //falsea

result = 66 + 'a';
console.log(result); //66a

result = null + false;
console.log(result); //0

result = null + true;
console.log(result); //1

result = true + false;
console.log(result); //1

result = false - true;
console.log(result); //-1

result = true + undefined;
console.log(result); //NaN

result = false + undefined;
console.log(result); //NaN

result = 1 + NaN;
console.log(result); //NaN

result = 'a' + NaN;
console.log(result); //aNaN

result = 1 + 2 + '3';
console.log(result); //33

result = 1 + (2 + '3');
console.log(result); //123

result = 1 + true + undefined + 's'; // 1+1+NaN+'s'=2+NaN+'s'=NaN+'s'=NaN
console.log(result); //NaNs

</script>
</body>
</html>

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