The if/else statement is a part of JavaScript's "Conditional" Statements, which are used to perform different actions based on different conditions. In JavaScript we have the following conditional statements: Useifto specify a block of code to be executed, if a specified condition is true ...
// reducer代码中的代码if(newState.inputVal!=""){newState.btnDisable=false;}// UI组件中提交 相比于if..else语句,switch语句可能会没那么熟练,switch语句只支持常量值相等的分支判断,而if语句支持更为灵活,任意布尔表达式均可 但通常比一系列嵌套if语句效率更高;逻辑也更加清晰 04 switch语句 将表达式的值与...
if (condition1) statement1 else if (condition2) statement2 else statement3 1. if (i > 30) { alert("大于 30"); } else if (i < 0) { alert("小于 0"); } else { alert("在 0 到 30 之间"); } 1. 2. 3. 4. 5. 6. 7. 2.js while循环 利用while 循环在指定条件为 true 时...
一、if条件语句 1、语法：if( condition ) statement1 else statement2;注：A、condition是条件，statement是需要执行的循环语句。B、当condition的条件满足时，执行statement1语句，不满足时，执行statement2语句。C、我们也可以不书写else语句，只书写前半部分语句，但是那样的话如果条件不满足，那么statement语句永远...
if (condition) { // block of code // execute this if condition is true } else { // block of code // execute this if condition is false }The if...else statement checks the condition and executes code in two ways:If condition is true, the code inside if is executed. And, the ...
if( condition ) statement1 else statement2; 注:A、condition是条件,statement是需要执行的循环语句。 B、当condition的条件满足时,执行statement1语句,不满足时,执行statement2语句。 C、我们也可以不书写else语句,只书写前半部分语句,但是那样的话如果条件不满足,那么statement语句永远也不会执行。
The else StatementUse the else statement to specify a block of code to be executed if the condition is false.if (condition) { block of code to be executed if the condition is true } else { block of code to be executed if the condition is false }...
// }else{ // alert("not 8") // } varweek="Sunday"; if(week=="Sunday"){ alert("7") }elseif(week=="周六"){ alert("6") }else{ alert("not 6 7") } 点击pycharm上面浏览器 修改control_statement.html 1 2 3 4 5 6 7 8 9 ...
How the JavaScript if statement works The if statement is the foundation for the if else statement as well as the “if, else if” statement. The “if” statement allows the programmer to execute a set of instructions if a condition is true. If the condition is false, then the code will...
syntax of i f statement is as follows if (condition) { code to be executed; //if conditionis true } The example below shows anif construct. <!-- /* *** Example If else construct .com *** */ vard = (); var time = d.get...