// initialization outside the loop let i = 0; // omit initialization and update statements for (; i < 3; ) { console.log(`i is ${i}`); // increment inside the loop body i++; } Run Code Output i is 0 i is 1 i is 2 Here, we have initialized i before the loop, which ...
Expression 3 can do anything like negative increment (i--), positive increment (i = i + 15), or anything else.Expression 3 can also be omitted (like when you increment your values inside the loop): Example let i = 0; let len = cars.length; let text = ""; for (; i < len; ...
For loopLooping an ArrayLooping through HTML headersWhile loopDo While loopBreak a loopBreak and continue a loopUse a for...in statement to loop through the elements of an object JavaScript Error Handling The try...catch statementThe try...catch statement with a confirm boxThe onerror event...
function factorial2(n) { // Another version using a different loop let i, product = 1; // Start with 1 for(i=2; i <= n; i++) // Automatically increment i from 2 up to n product *= i; // Do this each time. {} not needed for 1-line loops return product; // Return the...
ForStmt: a “for” statement; use ForStmt.getInit() and ForStmt.getUpdate() to access the init and update expressions, respectively. EnhancedForLoop: a “for-in” or “for-of” loop; use EnhancedForLoop.getIterator() to access the loop iterator (which may be a expression or variable ...
ECMAScript是语言规范的官方名称。因此,每当提到语言的版本时,人们都说ECMAScript。JavaScript 的当前版本是 ECMAScript 5;ECMAScript 6 目前正在开发中。 影响和语言的性质 JavaScript 的创造者 Brendan Eich 别无选择,只能很快地创建这种语言(否则,Netscape 可能会采用其他更糟糕的技术)。他从几种编程语言中借鉴了一些...
(dotslen); //透明度,每个"图片"的透明度 for (var i = 0; i < opacity.length; i++) //将透明度初始化为0 opacity[i] = 0; var nowIndex = 0; //当前要轮播的图片下标 var loop = null; //轮播计时器 var loop0 = new Array(opacity.length); //over计时器 var loop1 = new Array(...
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When a for loop is encountered, the initialization code is executed first, followed by the pretest condition. If the pretest condition evaluates to true, then the body of the loop is executed. After the body is executed, the post-execute code is run. The perceived encapsulation of the for ...
An integral part of these statements is comparison and increment operators discussed in Chapter 2. There are three types of loop statements: the while statement, the do while statement, and the for statement. Let's look at the while statement first. The while Statement The while statement is...