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fix: update datatype.md #49

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fix: update datatype.md #49

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4 changes: 2 additions & 2 deletions docs/webframe/javascript/datatype.md
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Original file line number Diff line number Diff line change
Expand Up @@ -320,7 +320,7 @@ console.log('2'+obj1)；
对下面`'2'+obj2`详细举例说明如下：

1. 左边为`string`，`ToPrimitive`原始值转换后不发生变化
2. 右边转化时同样按照`ToPrimitive`进行原始值转换，由于指定的type是`number`，进行`ToPrimitive`转化调用`obj2.valueof()`,得到的不是原始值，进行第三步
2. 右边转化时同样按照`ToPrimitive`进行原始值转换，由于指定的type是`number`，进行`ToPrimitive`转化调用`obj2.valueof()`,得到的不是原始值，进行第二步
3. 调用`toString()` ` return 'a'`
4. 符号两边存在`string`，而且是`+`号运算符则都采用`String`规则转换为`string`类型进行拼接
5. 输出结果`2a`
Expand Down Expand Up @@ -599,4 +599,4 @@ undefined + 1 // NaN
// null
console.log(String(undefined));
// undefined
```
```