2-JS运算符

 1 <button id="btn" onclick="suanShu()">运算</button> 2 <script> 3 ????// + - * / % ++ -- 4 ????var i = 521,j = 1314; 5 ????var sum = i + j; 6 ????var difference = j - i; 7 ????var product = i * j; 8 ????var quotient = j / i; 9 ????var congruent = j % i; ?//j除以i后的余数10 ????var addSelf = i++; ?????// ++在前，先+后运算，++在后，先运算后加 此时i= 52211 ????var selfCut = --j; ?????// --在前，先+后运算，--在后，先运算后加 此时j=131312 ????function suanShu() {13 ????????document.getElementById("sumId").innerHTML = "两数相加结果：" + sum;14 ????????document.getElementById("differenceId").innerHTML = "两数相减结果：" + difference;15 ????????document.getElementById("productId").innerHTML = "两数相乘结果：" + product;16 ????????document.getElementById("quotientId").innerHTML = "两数相除结果：" + quotient;17 ????????document.getElementById("congruentId").innerHTML = "两数取余结果：" + congruent;18 ????????document.getElementById("addSelfId").innerHTML = "i自加结果：" + addSelf;19 ????????document.getElementById("selfCutId").innerHTML = "j自减结果：" + selfCut;20 ????}21 </script>22 <p id="sumId"></p>23 <p id="differenceId"></p>24 <p id="productId"></p>25 <p id="quotientId"></p>26 <p id="congruentId"></p>27 <p id="addSelfId"></p>28 <p id="selfCutId"></p>

1 // = += -+ *= /= %=2 ????var x = i+=j; ??????//i = i+j3 ????var y = i -=j; ?????//i = i-j4 ????var m = i *= j; ????//i = i*j5 ????var n = i /= j; ?????//i = i/j

 1 <script> 2 ????var m = 12,n = "12"; 3 ????var x = 23,y = "23"; 4 ????document.write(m==n); ??//true 5 ????document.write(m===n); ?//false 6 ????document.write(m!=x); ??//true 7 ????document.write(m!==n); ?//true 8 ????document.write(m>y); ???//false 9 ????document.write(x<=n) ???//false10 </script>

1 <script>2 ????var i = 100,j = 200;3 ????document.write(i>100 && j<=200); ???//与，两者都需满足4 ????document.write(i>100 || j<=200); ???//或，两者满足其一5 ????document.write(!(i==j)); ???// 取反6 </script>

<script> ???var i = 11; ???document.write(i>10 ? "i大于10":"i小于10"); //条件为真执行前，为假执行后</script>