var condition = element.getAttribute("data-condition") === "true"; if (condition) { element.style.display = "block"; } else { element.style.display = "none"; } } </script> </head> <body onload="showElement()"> <div id="conditionalElement" data-condition="true" style="display: n...
所以,当你以 root 用户身份登录时,条件$(whoami) = 'root'才为真。 if-else 语句 上述代码中,如果当前用户不是 root,将看不到任何输出。当 if 条件为 false 的时候,需要将其执行的代码放到else语句中,如下所示: 复制 #!/bin/bashif[$(whoami)='root']; thenecho"You are root"elseecho"You are not...
可以利用语法知识,对 if else 进行简化, 例如,当 if else 满足一定条件时: if (condition1) { doSomeThing1(); } else if (condition2) { doSomeThing2(); } else if (condition3) { doSomeThing3(); } else if (condition4) { doSomeThing4(); } else { doSomeThing5(); }... 可以使用 swi...
如果第一个条件为假,则使用 else if 指定要测试的新条件 使用switch 选择要执行的多个代码块之一浏览器支持Statement if/else Yes Yes Yes Yes Yes语法if 语句指定在条件为真时要执行的代码块:if (condition) { // 条件为 true 时执行的代码块 }else 语句指定在条件为假时要执行的代码块:if...
I want to Display Text using If... else condition in html.for Example SingIn and SignOut.Thanks in advance.Keep smiling :)All replies (3)Monday, October 21, 2013 10:32 AM ✅AnsweredMuch of this depends on the exact details / condition that you want to use to determine if something ...
if,elseif,else Execute statements if condition is true collapse all in page Syntax ifexpressionstatementselseifexpressionstatementselsestatementsend Description ifexpression,statements, endevaluates anexpression, and executes a group of statements when the expression is true. An expression is true when its...
This is a modal window. No compatible source was found for this media. ageage}elseif(age<21){printf("You need to be over 21\n");}else{printf("You are over 18 and older than 21 so you can continue \n");}} Output Run the code and check its output − ...
Theif...elsestatement Theif...elseif...elsestatement Theswitch...casestatement We will explore each of these statements in the coming sections. TheifStatement Theifstatement is used to execute a block of code only if the specified condition evaluates to true. This is the simplest PHP's co...
[root@CentOs shell]# lsabc exit_code.sh hello.sh ShellTest.sh wz wz.sh [root@CentOs shell]#2,语法二:ifelse运算 适用范围:只需要一步判断,条件返回真干什么。 语句格式 if[ condition ]#condition 值为true or falsethen#条件为真的时候执行commands#代码块 一行或者多行代码fi#语句的结束 ...
使用if/else语句是一种在JavaScript中实现条件判断的常见方法。if/else语句允许根据条件的真假执行不同的代码块。 概念: if/else语句是一种控制流语句,用于根据条件的真假执行不同的代码块。它基于一个条件表达式,如果条件为真,则执行if代码块;如果条件为假,则执行else代码块。 分类: if/else语句是条件语句的一种...