计算器

作者: 幸而0407 | 来源:发表于2018-09-18 07:44 被阅读0次

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<script>
window.onload = function () { 
var value1 = document.getElementById("value1"); 
var value2 = document.getElementById("value2"); 
var value3 = document.getElementById("value3"); 
var btn = document.getElementById("btn"); 
var select = document.getElementById("select") 
btn.onclick = function () { 
var one, two, bignum; try { 
one = value1.value.split(".")[1].length } catch (e) { one = 1 } try {
two = value2.value.split(".")[1].length } catch (e) { two = 1 }
bignum = Math.pow(10, Math.max(one, two)) 
if (value1.value == "" || value2.value == "") {
alert('值不能为空') value1.value = ""; value2.value = ""; value3.value = ""; } 
else if ((value1.value != parseFloat(value1.value)) || (value2.value != parseFloat(value2.value))) { 
alert("输入的值有误") value1.value = ""; value2.value = ""; value3.value = ""; } 
else { if (select.value == "+") { value = (parseFloat(value1.value) * bignum + parseFloat(value2.value) * bignum) / bignum value3.value = value } 
else if (select.value == "-") { value = (parseFloat(value1.value) * bignum - parseFloat(value2.value) * bignum) / bignum value3.value = value } 
else if (select.value == "*") { value = (parseFloat(value1.value) * bignum * parseFloat(value2.value) * bignum) / (bignum * bignum) value3.value = value }
else { if (parseFloat(value2.value) == 0) { alert("除数不能为零") value1.value = ""; value2.value = ""; value3.value = ""; } 
else { value = ((parseFloat(value1.value) * bignum) / (parseFloat(value2.value) * bignum)) value3.value = value
}
} 
} 
} 
} 
</script>
</head> 
<body>
<div class="box"> 
       <h1>简易计算</h1> 
       <input type="text" id="value1">
       <select id="select"> 
               <option>+</option> 
               <option>-</option> 
               <option>*</option> 
               <option>/</option> </select> 
       <input type="text" id="value2"> 
       <input type="button" id="btn" value="="> 
       <input type="text" id="value3">
</div> 
</body> 
</html>