Some insights into the JS eval () function _javascript tips

First, eval is the basic rule of use

The ·1 eval () function computes a string and executes the JavaScript code in it.

2 eval (string)

3 string required. The string to evaluate, which contains the JAVASCRIPT expression to evaluate or the statement to execute.

4 eval () has only one parameter.

5 eval Use is more unsafe, forget to use cautiously

Two, Eval's error usage method

• 1 If the incoming argument is not a string, it returns the function directly.

• 2 If the argument is a string, it compiles the string as JavaScript code, if the compiler loser throws a syntax error exception.

• 3 If the compilation succeeds, begin executing this piece of code and return the value of the last expression or statement in the string.

4 if the last expression or statement has no value, it will eventually return to undefined.

Iii. Examples of Use

<! DOCTYPE html>  

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