`javascript:void(0)` 實際上做了什麼？

解開「javascript:void(0)」之謎

JavaScript，一種在Web 開發中廣泛使用的無處不在的程式語言，提供了各種各樣的內建運算符，每個運算符都有特定的用途。一個引起許多人好奇的運算子是神秘的「void」運算符，經常在程式碼片段中遇到，例如：

``` What exactly does this operator entail? **Understanding the Void Operator** The void operator in JavaScript has a peculiar function. When applied to an expression, it evaluates the expression and returns a special value - undefined. **Why Use the Void Operator in "javascript:void(0)"?** The void operator is often employed in conjunction with the "javascript:" URL schema. When applied to an anchor's href attribute, as in the example above, the purpose is to prevent execution and display of the evaluation result. **A Practical Application** Consider the typical scenario of a web page that includes a link for user login. By default, a javascript: URL would prompt the browser to redirect to a plain text version of the JavaScript evaluation output, such as "undefined." However, by utilizing void(0) as the href value, the link's click action will not cause redirection.

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