}else{varchildsAllowance = 5; } 嵌套if ... else 将另一个 if ... else 语句放在另一个中 - 嵌套它是完全可行的。例如,我们可以更新我们的天气预报应用程序,以显示更多的选择,具体取决于温度: if(choice === 'sunny') {if(temperature < 86) { para.textContent= 'It is ' + temperature + ' d...
JavaScript中的if else语句是一种条件语句,用于根据条件的真假来执行不同的代码块。它的基本语法如下: 代码语言:javascript 复制 if(条件){// 如果条件为真,执行这里的代码块}else{// 如果条件为假,执行这里的代码块} 在if else语句中,条件可以是任何可以求值为布尔值的表达式。如果条件为真,将执行if代码块中的...
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 not be executed. The syntax of the...
The else Statement Use theelsestatement 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 ...
1. if语句 if(condition){ statement; }elseif(condition){ statement; }else{ statement; } 2.switch选择控制语句 varx =3;switch(x){case1:statement;break;case2:statement;break;case3:statement;break;default:statement; } 3. for 语句 // Method 1vara=[1,"hello",true];for(variina){console.lo...
DoesnotqualifyfordrivingSet the variable to different valueandthentry... if...else if... else 语句 if ... else if ... 语句是 if ... else 的高级形式,可让JavaScript根据多种条件做出正确的决定。 if(expression1){Statement(s)to be executedifexpression1istrue}elseif(expression2){Statement(s...
语句和表达式之间的区别最好通过 JavaScript 有两种不同的if-then-else的方式来说明——作为语句: varx;if(y>=0){x=y;}else{x=-y;} 复制 或作为一个表达式: varx=y>=0?y:-y; 复制 你可以将后者用作函数参数(但不能使用前者): myFunction(y>=0?y:-y) ...
case 1 checks if a is the integer 1. It evaluates to true since both the type and the value of a match against case 1, thus assigning "one (number type)" to a. Comparison between switch statement and if...else statement. Both switch...case and if...else statements are used for...
8 shell if elif else 2019-12-19 18:59 − if 语句的判断条件,从本质上讲,判断的就是命令的退出状态。 语句语句格式同一行书写注意点用例1用例2 if 语句 if conditionthen statement(s)fi if condition; then statement(s... 声声慢43 0 589 ...
Working of JavaScript continue Statement Note: The continue statement is usually used inside decision-making statements such as if...else. Example 1: JavaScript continue With for Loop We can use the continue statement to skip iterations in a for loop. For example, for (let i = 1; i <...