复制代码 代码如下:

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