<script type="text/javascript"> js代码 </script>
<script type="text/javascript" src="1.js"></script>
<script> var str="abc"; alert(str); var str1="123" var mm = 123; alert(mm) alert(typeof(mm))//查看当前变量的数据类型 var str2 = null//表示对象为空 document.writeln(str) document.writeln(typeof(str)) var str3 //定义不赋值 document.writeln(str2)//undefined var flag = true; alert(flag); var obj = new Object();//Object类 document.writeln(obj) </script>
<script> var a = 1; if (a==1){ alert(1); }else{ alert(2) } var b = 2; switch(b){ case 2: alert(2); break; case 3: alert(3); break; default: alert("other") break; } var i= 5; while(i>1){ alert(i) i--; } for(var j = 1; j <=3; j++){ alert(j); } </script>
<script type="text/javascript"> var i = 123; document.write(i/1000*1000); //js里面不区分整数和小数 123/1000 = 0.123; var str ="456"; var str1 = "abc"; // alert(str+1)//4561 相加 字符串的连接 // alert(str-1)//455 真正的减法运算 document.write(str1-1)//提示NaN 表示不是数字 var flag = true; //true=1 // alert(flag+1);//2 var flag1 = false; //false=0 document.write(flag1+1)//1 //==只判断值,和类型无关;===判断值和类型 var aa = 5; var a1 = "5" if(a1===5){ document.write(5); }else{ document.write("other") } var result = -1 > 0? true : false; document.writeln("result:" +result) </script>
<head> <meta charset="UTF-8"> <title>乘法表</title> <style type="text/css"> table{ matgin: auto; border-collapse: collapse; } td { padding: 5px; } </style> </head> <body> <script type="text/javascript"> document.write("<table border='1' cellspacing='0'>") document.write("<caption>9*9乘法表</caption>"); for(var i = 1; i <= 9; i++){ document.write("<tr>"); for(var j = 1; j <= i; j++){ document.write("<td>"); document.write(j + "*" + i + "="+ j*i); document.write("</td>"); } document.write("</tr>"); } document.write("</table>"); </script> </body>
<script type="text/javascript"> var arr = [1,2,"3"]; // document.write(arr); document.write("length:" + arr.length); var arr1 = new Array(5); arr1[0] = "a"; arr1[1] = "b"; arr1[2] = "c"; var arr2 = new Array(3,4,5); document.write(arr2); </script>
<script> var arr1 = [1,8,3]; var arr2 = [4,5]; var arr3 = arr1.concat(arr2); document.writeln(arr3); arr3 = arr1.reverse(); document.writeln(arr3); document.writeln("<br>") arr3 = arr1.join("#"); document.writeln(arr3); document.writeln("<br>") /* 调用sort方法 1. 数字是按首位排序的 2. 如果是字母,就按字母顺序 如果想要升降序 :function (a,b) a -b 升序 */ arr1.sort(); document.writeln(arr1); document.writeln("<br>") arr4 = ['jack','Rose','Tom','Jerry','Kate']; arr4.sort(); document.writeln(arr4); document.writeln("<br>") var method = function (a,b) { return b - a; }; arr1.sort(function (a,b) { return b - a; }); document.writeln(arr1); document.writeln("<br>") </script>
<script type="text/javascript"> /* *第一种方法:使用函数关键字 * 函数的参数列表里面,不需要写var 直接写参数名称 * function 方法名(参数列表){ * 方法体, * 返回值可有可无} * */ function test(){ alert("a"); } //调用方法 // test(); function add1(a,b){ var sum = a + b; alert(a+b); } // add1(2,3); function add2(a,b,c){ var sum1 = a + b + c; return sum1; } alert(add2(2,3,4)); //第二种方式 匿名函数 var add3 = function(m,n){ document.write(m+n); } add3(5,6); //第三种方式:动态函数 ,使用到js里面的内置对象Function // var add4 = new Function("x,y","var sum; sum=x+y;return sum;"); var canshu = "x,y"; var fagnfati = "var sum;sum=x+y;return sum;" var add4 = new Function(canshu,fagnfati); alert(add4(1,9)); </script>
<body> <img src="../img/0.jpg" width="800px" id="myPic"> <script > var i = 0; var method = function () { var img = document.getElementById("myPic"); img.src = "../img/"+i+".jpg"; i++; if(i == 5){ i = 0; } } window.setInterval(method,1000) </script> </body>
<script type="text/javascript"> document.write("现在时间是:" + new Date() + "<hr/>"); document.write("现在时间是:" + new Date().toLocaleString() + "<hr/>"); var a = "123abc123"; var i = parseInt(a); document.write(i + "<br/>"); var b = "3.14abc123"; i = parseInt(b); document.write(i + "<br/>"); var age = "1012"; document.write(isNaN(age) + "<br/>");//不是一个数字字符,返回true var str = "hello world 你好 世界"; document.write(str + "<hr/>"); str = encodeURI(str); document.write(str + "<hr/>"); //对编码后的URL进行解码 str = decodeURI(str); document.write(str + "<hr/>"); </script>
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