<body><input type="button" value="1" onclick="one()" id="a1"><input type="button" value="2" onclick="two()" id="a2"><input type="button" value="-" onclick="add()" id="a3" ><input type="button" value="=" onclick="dy()" ><input type="text" value="" id="a4" ></body><script>var a_4 = ""function one(){ var a_1 = document.getElementById("a1").value }function two(){ var a_2 = document.getElementById("a2").value }function add(){ var a_3 = document.getElementById("a3").value }function dy(){ document.getElementById("a4").value = a_4 }</script>
3 回答
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h5
TA贡献19条经验 获得超9个赞
<body>
<input type="button" value="1" onclick="one()" id="a1">
<input type="button" value="2" onclick="two()" id="a2">
<input type="button" value="-" onclick="minus()" id="a3" >
<input type="button" value="+" onclick="add()" id="a5" >
<input type="button" value="=" onclick="dy()" >
<input type="button" value="c" onclick="cl()" >
<input type="text" value="" id="a4" >
</body>
<script>
var a_4 = ""
function cl(){
a_4=""
document.getElementById("a4").value = a_4
}
function one(){
a_4 += document.getElementById("a1").value
document.getElementById("a4").value = a_4
}
function two(){
a_4 += document.getElementById("a2").value
document.getElementById("a4").value = a_4
}
function minus(){
a_4 += document.getElementById("a3").value
document.getElementById("a4").value = a_4
}
function add(){
a_4 += document.getElementById("a5").value
document.getElementById("a4").value = a_4
}
function dy(){
document.getElementById("a4").value = eval(a_4)
a_4=document.getElementById("a4").value
}
</script>
堂堂堂堂糖糖糖童鞋
TA贡献101条经验 获得超58个赞
<script>
var a_4 = ""
var numbers = []
function one () {
var a_1 = document.getElementById("a1").value
numbers.push(a_1)
}
function two() {
var a_2 = document.getElementById("a2").value
numbers.push(a_2)
}
function add() {
if (!numbers.length) {
alert('请先选择一个数字')
return
}
var a_3 = document.getElementById("a3").value
numbers.push(a_3)
}
function dy() {
if (numbers.length !== 3) {
alert('操作有误')
return
}
if (numbers[1] === '-') {
a_4 = numbers[0] * 1 - numbers[2] * 1
}
document.getElementById("a4").value = a_4
}
</script>
千秋此意
TA贡献158条经验 获得超188个赞
<html>
<head>
<meta charset="utf-8">
<title>test</title>
</head>
<body>
<input type="button" value="1" onclick="one(this.value)" id="a1" />
<input type="button" value="2" onclick="one(this.value)" id="a2" />
<input type="button" value="-" onclick="calc(this.value)" id="a3" />
<input type="button" value="=" onclick="dy()" />
<input type="button" value="cls" onclick="cls()" />
<input type="text" value="" id="a4" readonly />
</body>
<script>
var a4 = document.getElementById('a4');
var c = true;
a4.value = '';
function one(val) {
if (c === false) {
cls();
}
a4.value += val;
}
function calc(operator) {
if (/\d/.test(a4.value.substr(-1)) && c) {
a4.value += operator;
} else {
alert('请输入正确的表达式!');
}
}
function dy() {
if (!c || !(/^\d+.*\d+$/g.test(a4.value))) return;
a4.value += ('=' + new Function('return ' + a4.value)());
c = false;
}
function cls() {
c = true;
a4.value = '';
}
</script>
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