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Understand eval () function in JS and write a function trim () to remove spaces between the left and right strings.

Source: Internet
Author: User
Tags jquery library
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Understand eval () function in JS and write a function trim () to remove spaces between the left and right strings.

Trim () is a reference to the jquery source code, you can rest assured to use.

My understanding of eval () functions in JS is not necessarily correct.

<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en" "http://www.w3.org/TR/html4/loose.dtd"> <HTML>  Code The content in eval () brackets is the JS Code embedded in Js. * /// Eval ("alert ('" + F + "')"); // calculate JS scripts, which have the same effect as alert (f. Eval ("Var Gg = 'hahaha'"); alert (eval ("GG"); // eval contains embedded JS Code, equivalent to VaR Gg = 'haha', alert (gg); // alert (eval ('3 + 4'); // calculates mathematical operations, result 7: // alert (eval ('3' + '4'); // calculate the string. Result 34: Alert ("START" + trim ('abc def ') + "end"); // trim function in jquery, which filters out the first space. Function trim (t) {return (T | ""). Replace (/^ \ s + | \ s + $/g, "") ;}</SCRIPT>

 

 

 

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