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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<style>
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body,html{
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height: 100%;
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margin: 0;
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display: flex;
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justify-content: center;
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align-items: center;
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}
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button {
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width: 40px;
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height: 40px;
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font-size: 16px;
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margin-top: 2px;
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}
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#back {
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width: 85px;
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height: 40px;
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}
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#t1 {
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width: 170px;
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margin-bottom: 5px;
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padding: 3px 0px 3px 0px;
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}
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.all {
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border: 1px solid black;
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width: 175px;
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padding:0px 2px 2px 2px;
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}
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p{
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text-align: center;
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}
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</style>
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<body>
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<div class="all">
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<p>计算器</p>
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<div>
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<input type="text" id="t1">
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</div>
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<div>
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<button onclick="cls()" id="C">C</button>
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<button onclick="addStr('%')">%</button>
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<button onclick="del()" id="back">←</button>
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</div>
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<div>
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<div>
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<button onclick="addStr(7)">7</button>
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<button onclick="addStr(8)">8</button>
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<button onclick="addStr(9)">9</button>
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<button onclick="addStr('/')">÷</button>
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</div>
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<div>
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<button onclick="addStr(4)">4</button>
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<button onclick="addStr(5)">5</button>
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<button onclick="addStr(6)">6</button>
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<button onclick="addStr('*')">×</button>
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</div>
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<div>
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<button onclick="addStr(1)">1</button>
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<button onclick="addStr(2)">2</button>
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<button onclick="addStr(3)">3</button>
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<button onclick="addStr('-')">-</button>
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</div>
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<div>
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<button onclick="addStr('.')">.</button>
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<button onclick="addStr(0)" id="zero">0</button>
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<button onclick="calc()" id="equal">=</button>
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<button onclick="addStr('+')">+</button>
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</div>
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</div>
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</div>
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<script>
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function addStr(s) {
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var str = document.getElementById("t1");
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str.value = str.value + s;
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}
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function calc() {
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var str = document.getElementById("t1");
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try {
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var res = eval(str.value);
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if (!isNaN(res) && isFinite(res)) {
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str.value = res;
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} else {
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str.value = "错误";
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}
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} catch (e) {
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str.value = "错误";
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}
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}
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function cls() {
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var str = document.getElementById("t1");
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str.value = "";
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}
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function del() {
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var str = document.getElementById("t1");
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var str1 = str.value.substr(0, str.value.length - 1);
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str.value = str1;
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}
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</script>
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</body>
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</html>
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