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Execution of uncertain JavaScript Functions

Source: Internet
Author: User
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In JavaScript, sometimes you only know the name of a function, but you are not sure whether the function exists. How can you determine whether the function exists and execute it. One method is to use eval () to execute the concatenated program string, but it may cause performance problems. Another method is to use the symbolic attribute to access the function, because the function is a property of the window object.

Use Window [function name] to represent the function object, and use window [function name] () to execute or call the function.

Example:

<HTML>

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