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04-JavaScript基础/09-数据类型转换.md
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@ -101,7 +101,7 @@ console.log(a1.toString()); // "qianguyihao"
console.log(a2.toString()); // "29" console.log(a2.toString()); // "29"
console.log(a3.toString()); // "true" console.log(a3.toString()); // "true"
console.log(a4.toString()); // "1,2,3" console.log(a4.toString()); // "1,2,3"
console.log(a5.toString()); // "object" console.log(a5.toString()); // "[object Object]"
// 下面这两个，打印报错 // 下面这两个，打印报错
console.log(a6.toString()); // 报错：Uncaught TypeError: Cannot read properties of null console.log(a6.toString()); // 报错：Uncaught TypeError: Cannot read properties of null
@ -299,7 +299,7 @@ parseInt('5'); // 得到的结果是数字 5
（2）如果字符串不是以数字开头，则转换为 NaN。 （2）如果字符串不是以数字开头，则转换为 NaN。
（3）如果字符串是一个空串或者是一个全是空格的字符串，转换时会报错。 （3）如果字符串是一个空串或者是一个全是空格的字符串，则转换为 NaN。
**情况二：Boolean --> 数字**，结果为：NaN **情况二：Boolean --> 数字**，结果为：NaN