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javascript语法
电动机的博客
Original
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总结

1、switch （n）{  case 1:     case 2:      .....deault:  }

2、 for (var i = 0; i < Things.length; i++) {}

3、while(i < Things.length){ ...... i++}

4、do{ ...... i++}   }while((i < Things.length)

5、for(var in object){......} 遍历出对象、数组中每个键值对，var是对象、数据的下标  表达式：object[var]

6、break直接跳出最近的循环；continue 跳出循环的一个迭代，循环还继续

7、函数 ：自定义函数 function name(参数序列){......}

                 匿名函数  var fun=function(){......}，直接用变量调用

                 构造函数 Function(.......) ,直接在括号中执行

8、return ：函数中碰到return就跳出函数，后面的语句不执行; return 可以带返回值并回传给函数的调用处

实例

<!DOCTYPE html>
<html>
<head>
	<title>3.27作业</title>
</head>

<!-- 九九乘法口令函数 其中：x为最大乘数-->
<script type="text/javascript">
	function mulTable(x){
         for (var i = 1; i <=x; i++) {
         	for (var j = 1; j <=i; j++) {
         		var space='   '
         		if (i*j<10) {
         			space +='  '
         		}
         		document.write(i+'x'+j+'='+(i*j)+space)
         	}
          document.write('<br>');
        
         }
	}
// 三角形函数 其中 z为三角形的行次数
 	function triangle(z){
		var i=0,x='*';
		while(i<z){
			document.write(x+'<br>');
			x=x+'**';	
		    i++;
		}	
	}
</script>
<body>
	<div>
        <script type="text/javascript">
	        mulTable(9);
        </script>
    </div>
    <div style="text-align: center;">
        <script type="text/javascript"> 
	        triangle(20)
        </script>
	</div>
</body>
</html>

运行实例 »

点击 "运行实例" 按钮查看在线实例

，return后面可以带返回值

Correction status：Uncorrected

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