javascript不同类型数据之间运算的转换

来源：互联网发布：买域名是啥编辑：程序博客网时间：2024/06/06 16:28
<!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>
阅读全文
1 0