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

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