<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>Ch5_5_2.htm</title>
</head>
<body>
<h2>算術運算子的使用</h2>
<hr>
<script>
var x, y;
var intInc = 20;
var intDec = 20;
var strTitle1 = "JavaScript是"
var strTitle2 = "一種網頁設計技術"
document.write("負號運算: -100 = " + -100 + "<br/>");
intInc++;
document.write("遞增運算: A++ = " + intInc + "<br/>");
intDec--;
document.write("遞減運算: A-- = " + intDec + "<br/>");
document.write("乘法運算: 7 * 5 = " + 7*5 + "<br/>");
document.write("除法運算: 10 / 4 = " + 10/4 + "<br/>");
document.write("餘數運算: 9 % 6 = " + 9%6 + "<br/>");
document.write("加法運算: 7 + 3 = " + (7+3) + "<br/>");
document.write("減法運算: 5 - 4 = " + (5-4) + "<br/><hr/>");
// 測試Pre-/Post- 運算子
x = 120;
y = 120;
document.write("x++ = " +x+++":x = " + x + "<br/>");
document.write("--y = " +--y+":y = " + y + "<br/><hr/>");
document.write("字串連接: " + (strTitle1+strTitle2) + "<br/>");
</script>
</body>
</html>
顯示結果:
算術運算子的使用
負號運算: -100 = -100
遞增運算: A++ = 21
遞減運算: A-- = 19
乘法運算: 7 * 5 = 35
除法運算: 10 / 4 = 2.5
餘數運算: 7 % 6 = 1
加法運算: 7 + 3 = 10
減法運算: 5 - 4 = 1
x++ = 120:x = 121
--y = 119:y = 119
字串連接: JavaScript是一種網頁設計技術