Question

我有以下代码。

function Test() {
    this.myTest = "Test";
}

Test.prototype.toString = function testToString() {
    return this.myTest;
};

var test = new Test();
console.log(test);

我希望这会打印Test，但会打印Test { myTest: 'Test' }。我认为重写toString应该在尝试转换为字符串时使用该新函数。任何想法为什么这不起作用？

Answer 1

根据规范（console.log - ＆gt; Logger - ＆gt; Printer）console.log的实施最终取决于实施。

因此，在console.log(obj)的实施环境中，您可能不仅仅是Printer("log", obj.toString())。

Answer 2

＆＃13;

\documentclass{report}

\usepackage{tocloft,lipsum,pgffor,sectsty}

\setcounter{tocdepth}{3}% Include up to \subsubsection in ToC

% Font changes to ToC content of sectional units
\renewcommand{\cftpartfont}{\normalfont\sffamily\bfseries}% \part font in ToC
\renewcommand{\cftchapfont}{\normalfont\large\itshape}    % \chapter font in ToC
\renewcommand{\cftsecfont}{\normalfont\slshape}           % \section font in ToC
\renewcommand{\cftsubsecfont}{\normalfont\itshape}        % \subsection font in ToC
\renewcommand{\cftsubsubsecfont}{\normalfont\small}       % \subsubsection font in ToC

% Font changes to document content of sectional units
\renewcommand{\partfont}{\normalfont\Huge\bfseries}
\renewcommand{\chapterfont}{\normalfont\huge\bfseries}
\renewcommand{\sectionfont}{\normalfont\LARGE\bfseries}

\begin{document}

\tableofcontents% ToC

% Create a dummy document with multiple (5) levels of sectional units
\foreach \curpart in {First, Second, Third, Last} {
  \part{\curpart{} part}
  \foreach \curchap in {First, Second, Third, Last} {
    \chapter{\curchap{} chapter} \lipsum[1]
    \foreach \cursec in {First, Second, Third, Last} {
      \section{\cursec{} section}\lipsum[2]
      \foreach \cursubsec in {First, Second, Third, Last} {
        \subsection{\cursubsec{} subsection}\lipsum[3]
        \foreach \cursubsubsec in {First, Second, Third, Last} {
          \subsubsection{\cursubsubsec{} subsubsection}\lipsum[4]
        }% \subsubsection
      }% \subsection
    }% \section
  }% \chapter
}% \part

\end{document}

＆＃13;

Answer 3

根据这里的一些答案，我能够通过使用以下代码解决这个问题。虽然它与现有的一些答案相似但略有不同，所以决定在这里发布。

function Test() {
    this.myTest = "Test";
}

Test.prototype.toString = function testToString() {
    return this.myTest;
};

var test = new Test();
console.log(test + "");

只需在+ ""的末尾添加console.log即可完美运行，并运行toString功能。

覆盖prototype.toString不起作用

3 个答案: