javascriptif,javascriptif elseif

javascript里如何实现if判断？

1234567891011    script type="text/javascript"    if(playpage.from=a href=";tn=44039180_cprfenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Yvm1fsnWT3rHTsmWNhuhDd0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6K1TL0qnfK1TL0z5HD0IgF_5y9YIZ0lQzqlpA-bmyt8mh7GuZR8mvqVQL7dugPYpyq8Q1RkrjRYnHcdrjfzPW6sPjRvPf" target="_blank"class="baidu-highlight"奇艺/a){        document.write('\script type="text/javascript" src="/Public/Nplayer/qiyi.a href=";tn=44039180_cprfenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Yvm1fsnWT3rHTsmWNhuhDd0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6K1TL0qnfK1TL0z5HD0IgF_5y9YIZ0lQzqlpA-bmyt8mh7GuZR8mvqVQL7dugPYpyq8Q1RkrjRYnHcdrjfzPW6sPjRvPf" target="_blank" class="baidu-highlight"js/a"\\\/script\');        return;    }    if(playpage.from=土豆){        document.write('\script type="text/javascript" src="/Public/Nplayer/tudou.a href=";tn=44039180_cprfenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Yvm1fsnWT3rHTsmWNhuhDd0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6K1TL0qnfK1TL0z5HD0IgF_5y9YIZ0lQzqlpA-bmyt8mh7GuZR8mvqVQL7dugPYpyq8Q1RkrjRYnHcdrjfzPW6sPjRvPf" target="_blank" class="baidu-highlight"js/a"\\\/script\');        return;    }    //.....省略,大致就是这个意思/script

javascript里if语句的条件写法！

if (条件)

{

只有当条件为 true 时执行的代码

}

实例

当时间小于 20:00 时，将得到问候 "Good day"，否则将得到问候 "Good evening"。

if (time20)

{

x="Good day";

}

else

{

x="Good evening";

}

JavaScript中if嵌套和多条件判断

functionmark(){varnuma=prompt("请输入你的笔试成绩：");varnumb=prompt("请输入你的实践成绩：");if(numa=60numb=60){if(numa100||numb100){document.write("你输入的成绩有误，分数不能大于100！！！")}

JavaScript if函数4个条件怎么用？

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

javascript的if语句怎么写？

给你一个例子吧！

html

body

script type="text/javascript"

var d = new Date()

var time = d.getHours()

if (time 10)

{

document.write("b早安/b")

}

/script

p本例演示 If 语句。/p

p如果浏览器时间小于 10，那么会向您问“早安”。/p

/body

/html

javascript中的if条件a=b 并且b=d怎么表 &&好像不能用

能用。

if的语法：

if(条件){

 语句体

}

示例：

条件中如果是与()连接，则是a==bb==d

if(a==bb==d){

  alert("成功");

}else{

  alert("失败");

}