这篇文章主要介绍了Javascript 实现简单计算器实例代码的相关资料,需要的朋友可以参考下
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<!DOCTYPE html><html><head><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></head><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></html> |
(转载) http://www.jb51.net/article/95464.htm