For loop example: 1 2 3 4 5 6 var sum = 0; for (var i=1; i<=100; i++) { sum += i; } alert(sum); //5050 You may use break to jump out of the loop:1 2 3 4 5 6 7 var sum = 0; for (var i=1; i<=100; i++) { if (i == 50) break; stop the loop...
for...in loop and prototypesObjects in JavaScript can have properties inherited from object prototypes.For example, objects created using Array and Object constructors inherit many properties from Object.prototype and String.prototype. The for...in statement iterates over own properties of the object...
Example Let's look at an example that shows how to use a for-in loop in JavaScript. For example: var totn_colors = { primary: 'blue', secondary: 'gray', tertiary: 'white' }; for (var color in totn_colors) { console.log(totn_colors[color]); } In this example, the following...
which means that it takes the command right after the loop, without executing the rest of it, but instead doing whatever code is next. Here’s an example of how you can use it:
see something that we did not explain: the expressionbreak;. That expression is used to jump out of the loop, which means that it takes the command right after the loop, without executing the rest of it, but instead doing whatever code is next. Here’s an example of how you can use ...
Here's a simple example of thefor...inloop in JavaScript. Read the rest of the tutorial to learn more. Example conststudent = {name:"Monica",class:7}; // loop through the keys of student objectfor(letkeyinstudent) {// display the key-value pairsconsole.log(`${key}=>${student[key...
For loop example over an iterable object In the following example, we’re looping over the variableobjand logging each property and value: constobj={"a":"JavaScript",1:"PHP","b":"Python",2:"Java"};for(letkeyinobj){console.log(key+": "+obj[key])}// Output:// "1: PHP"// "...
JavaScript for...in Loop - Learn how to use the for...in loop in JavaScript to iterate over properties of objects effectively.
<!-- var aProperty; document.write("Navigator Object Properties "); for (aProperty in navigator) { document.write(aProperty); document.write(""); } document.write ("Exiting from the loop!"); //--> Set the variable to different object and...
JavaScript 支持不同类型的循环:for - 循环代码块一定的次数 for/in - 循环遍历对象的属性 while - 当指定的条件为 true 时循环指定的代码块 do/while - 同样当指定的条件为 true 时循环指定的代码块For 循环for 循环是您在希望创建循环时常会用到的工具。 下面是 for 循环的语法:...