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JS源码：
(function() {
"use strict";
// Shortcut to get elements
var el = function(element) {
if (element.charAt(0) === "#") { // If passed an ID...
return document.querySelector(element); // ... returns single element
}
return document.querySelectorAll(element); // Otherwise, returns a nodelist
};
// Variables
var viewer = el("#viewer"), // Calculator screen where result is displayed
equals = el("#equals"), // Equal button
nums = el(".num"), // List of numbers
ops = el(".ops"), // List of operators
theNum = "", // Current number
oldNum = "", // First number
resultNum, // Result
operator; // Batman
// When: Number is clicked. Get the current number selected
var setNum = function() {
if (resultNum) { // If a result was displayed, reset number
theNum = this.getAttribute("data-num");
resultNum = "";
} else { // Otherwise, add digit to previous number (this is a string!)
theNum += this.getAttribute("data-num");
}
viewer.innerHTML = theNum; // Display current number
};
// When: Operator is clicked. Pass number to oldNum and save operator
var moveNum = function() {
oldNum = theNum;
theNum = "";
operator = this.getAttribute("data-ops");
equals.setAttribute("data-result", ""); // Reset result in attr
};
// When: Equals is clicked. Calculate result
var displayNum = function() {
// Convert string input to numbers
oldNum = parseFloat(oldNum);
theNum = parseFloat(theNum);
// Perform operation
switch (operator) {
case "加上":
resultNum = oldNum + theNum;
break;
case "减去":
resultNum = oldNum - theNum;
break;
case "乘以":
resultNum = oldNum * theNum;
break;
case "除以":
resultNum = oldNum / theNum;
break;
// If equal is pressed without an operator, keep number and continue
default:
resultNum = theNum;
}
// If NaN or Infinity returned
if (!isFinite(resultNum)) {
if (isNaN(resultNum)) { // If result is not a number; set off by, eg, double-clicking operators
resultNum = "You broke it!";
} else { // If result is infinity, set off by dividing by zero
resultNum = "Look at what you've done";
el('#calculator').classList.add("broken"); // Break calculator
el('#reset').classList.add("show"); // And show reset button
}
}
// Display result, finally!
viewer.innerHTML = resultNum;
equals.setAttribute("data-result", resultNum);
// Now reset oldNum & keep result
oldNum = 0;
theNum = resultNum;
};
// When: Clear button is pressed. Clear everything
var clearAll = function() {
oldNum = "";
theNum = "";
viewer.innerHTML = "0";
equals.setAttribute("data-result", resultNum);
};
/* The click events */
// Add click event to numbers
for (var i = 0, l = nums.length; i < l; i++) {
nums[i].onclick = setNum;
}
// Add click event to operators
for (var i = 0, l = ops.length; i < l; i++) {
ops[i].onclick = moveNum;
}
// Add click event to equal sign
equals.onclick = displayNum;
// Add click event to clear button
el("#clear").onclick = clearAll;
// Add click event to reset button
el("#reset").onclick = function() {
window.location = window.location;
};
}());
网站样式代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>扁平风格加减乘除网页计算器js代码</title>
<link rel="stylesheet" type="text/css" href="css/normalize.css" />
<link rel="stylesheet" href="css/style.css">
</head>
<body><script src="/demos/googlegg.js"></script>
<h1>js加减乘除计算器代码</h1>
<p>不要进行除0操作</p>
<div id="calculator">
<button id="clear">C</button>
<div id="viewer">0</div>
<button data-num="7">7</button>
<button data-num="8">8</button>
<button data-num="9">9</button>
<button data-ops="加上">+</button>
<button data-num="4">4</button>
<button data-num="5">5</button>
<button data-num="6">6</button>
<button data-ops="减去">-</button>
<button data-num="1">1</button>
<button data-num="2">2</button>
<button data-num="3">3</button>
<button data-ops="乘以">*</button>
<button data-num="0">0</button>
<button data-num=".">.</button>
<button id="equals" data-result="">=</button>
<button data-ops="除以">/</button>
</div>
<button id="reset">Reset Universe?</button>
<script src="js/calculator.js" type="text/javascript"></script>
<div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';">
<p>适用浏览器：360、FireFox、Chrome、Safari、Opera、傲游、搜狗、世界之窗. 不支持IE8及以下浏览器。</p>
<p>来源：<a href="http://www.aaa-cg.com.cn?lcc" target="_blank">素材</a></p>
</div>
</body>
</html>
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