Javascript implements simple calculator instance code

JavaScript implementation Simple Calculator instance code this article mainly introduces the JavaScript implementation of simple calculator instance code of the relevant information, the need for friends can refer to the following

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<!DOCTYPE html><meta charset="utf-8"><title>js简单计算器</title><style type="text/css">*{margin:0px;padding:0px;}input{margin-top:2px;margin-left:2px;width:230px;height:30px;text-align:right;}button{margin-top:2px;margin-left:2px;width:50px;height:50px;}#container{margin-left:1px;border:1px solid #E4E4E4;background:#BBBBBB;width:235px;height:215px;}</style><script>function onLoad(){//加载完毕后光标自动对应到输入框document.getElementById("input").focus();}//读取按钮的值，传给输入框function inputEvent(e){//把val的值改为每个事件的innerHTML值var val=e.innerHTML;//获取input标签var xsval=document.getElementById("input");//标签里的value连接每个事件的innerHTML值xsval.value+=val; }//计算出结果function inputOper(){var xsval=document.getElementById("input");xsval.value=eval(document.getElementById("input").value);}//清零function clearNum(){var xsval=document.getElementById("input");xsval.value="";document.getElementById("input").focus();}//退格function backNum(){var arr=document.getElementById("input");arr.value=arr.value.substring(0,arr.value.length-1);}

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</script><body onload="onLoad()"><input id="input" type="text"><div id="container"><div><button onclick="inputEvent(this)">1</button><button onclick="inputEvent(this)">2</button><button onclick="inputEvent(this)">3</button><button onclick="inputEvent(this)">+</button></div><div><button onclick="inputEvent(this)">4</button><button onclick="inputEvent(this)">5</button><button onclick="inputEvent(this)">6</button><button onclick="inputEvent(this)">-</button></div><div><button onclick="inputEvent(this)">7</button><button onclick="inputEvent(this)">8</button><button onclick="inputEvent(this)">9</button><button onclick="inputEvent(this)">*</button></div><div><button onclick="inputEvent(this)">0</button><button onclick="inputEvent(this)">.</button><button onclick="inputOper(this)">=</button><button onclick="inputEvent(this)">/</button></div></div><button onclick="clearNum()">清零</button><button onclick="backNum()">退格</button></body>

(reproduced) http://www.jb51.net/article/95464.htm

Javascript implements simple calculator instance code