Pure JavaScript Code implements calculator functions (three methods) _javascript tips

Today to share a calculator program written in pure JavaScript code, many industries can use this program, such as the decoration budget, loan rates and so on.

First look at the effect after the completion:

Method One:

Write the code as follows:

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  

code two:

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  

method Three:

<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  

Above in three ways to achieve the pure JavaScript code implementation calculator function, I hope you like.