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i
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...
}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...
// Two slashes start single-line commentsvarx;// declaring a variablex=3+y;// assigning a value to the variable `x`foo(x,y);// calling function `foo` with parameters `x` and `y`obj.bar(3);// calling method `bar` of object `obj`// A conditional statementif(x===0){// Is ...
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...
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...
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 0 591 ...
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...
Working of JavaScript break Statement The image below shows the working of the break statement in for and while loops. Working of JavaScript break Statement Note: The break statement is usually used inside decision-making statements such as if...else. Example 1: JavaScript break With for Loop...