js switch case default 的用法示例介绍

switch(tagName){ 
case "span": 
node = element.parent().parent(); 
element = element; 
break; 
case "td": 
node = element.parent(); 
element = element.find("span"); 
break; 
default: 
node = element; 
break; 
} 
以上语句等同于 
if(tagName == "span"){ 
node = element.parent().parent(); 
element = element; 
}else if(tagName == "td"){ 
node = element.parent(); 
element = element.find("span"); 
}else{ 
node = element; 
}

注意每个case后，一定要加：break；
default，就相当于else