JavaScript if函数4个条件怎么用？

Question

比如：星期一、二运行A.JS；星期三、四运行B.JS；星期五、六运行C.js，星期日运行D.js

Answer 1

1234567891011var&nbsp;myd=new&nbsp;Date();var&nbsp;myweek=myd.getDay();if(myweek==1||myweek==2){&nbsp;&nbsp;&nbsp;&nbsp;document.write("<script&nbsp;src=\"A.js\"></script>")}else&nbsp;if(myweek==3||myweek==4){&nbsp;&nbsp;&nbsp;&nbsp;document.write("<script&nbsp;src=\"B.js\"></script>")}else&nbsp;if(myweek==5||myweek==6){&nbsp;&nbsp;&nbsp;&nbsp;document.write("<script&nbsp;src=\"C.js\"></script>")}else&nbsp;if(myweek==0){&nbsp;&nbsp;&nbsp;&nbsp;document.write("<script&nbsp;src=\"D.js\"></script>")}

Answer 2

var week = new Date().getDay();if (week == 0) {document.write("<script src='D.js'><\/script>");} else if (week == 1 || 2) {document.write("<script src='A.js'><\/script>");} else if (week == 3 || 4) {document.write("<script src='B.js'><\/script>");} else if (week == 5 || 6) {document.write("<script src='C.js'><\/script>");}大致方向具体语法有待测试

Answer 3

var obj={};obj.Funtext=function(){};if(obj.Funtext){alert("true obj.Funtext;");}else{alert("false obj.Funtext");}obj.Funtext=function(){};if(obj.Funtext()){alert("true obj.Funtext();");}else{alert("false obj.Funtext()");}