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This article introduces the knowledge of "how to realize the simple calculator function of javascript". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Javascript implements a simple calculator with only two input input boxes to simply add, subtract, multiply and divide:

Simple Calculator body {border: 2px # 00FFF;}

Simple calculator +-* /

Calculation results:

Function cal () {var num1=document.getElementById ("num1") .value; var result=document.getElementById ("result"); calculate var res=eval ("(" + num1+ ")") if try {/ / has a value; result [XSS _ clean] = res;} catch (e) {console.log (e) Result [XSS _ clean] = "expression exception";}}

Achieve results:

Background image settings in body:

Background-repeat: original size of no-repeat; image

Background-size:100%; pictures are all covered.

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