javascript 无效函数

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Answer 1

void() :

This operator allows inserting expressions that produce side effects into places where an expression that evaluates to undefined is desired.

The void operator is often used merely to obtain the undefined primitive value, usually using "void(0)" (which is equivalent to "void 0"). In these cases, the global variable undefined can be used instead (assuming it has not been assigned to a non-default value). Note, however, that the javascript: pseudo protocol is discouraged over other alternatives, such as unobtrusive event handlers.

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