If you have read the previous chapter, about the for loop, you will discover that a while loop is much the same as a for loop, with statement 1 and statement 3 omitted. The loop in this example uses aforloop to collect the car names from the cars array: ...
JavaScript : while statement The while loop calculate the sum of odd numbers between 0 to 10. List of numbers : JS Codevar x = 1; var y = 0; var z = 0; document.getElementById("result").innerHTML = "List of numbers : "; while (x <=10 ) { z =...
$ node main.js i: 0, j: 0 i: 0, j: 1 i: 1, j: 0 i: 1, j: 1 Do...while with continueThe continue statement skips the current iteration in a do...while loop. main.js let k = 0; do { k++; if (k === 2) { continue; } console.log(k); } while (k < 4); ...
The example defines the while loop that starts with i=0. The loop will continue to run as long as i is less than, or equal to 10. The value of i will increase by 1 each time the loop runs. You can try this example online at the link below, which will open in a new window. ...
...WHILE [ > ] WHILE expression LOOP statements END LOOP [ label ]; 只要条件表达式为真,其块内的语句就会被循环执行...[ > ] FOR record_or_row IN query LOOP statements END LOOP [ label ]; 这是另外一种形式的FOR循环,在该循环中可以遍历命令的结果并操作相应的数据...
print("no,please input") 3、限制输入三次，超过三次，JS 中有多种方式实现循环：for; for in; ...
JS Functions JavaScript Function Variable Scope JavaScript Hoisting JavaScript Recursion JS Objects JavaScript Objects JavaScript Methods & this JavaScript Constructor JavaScript Getter and Setter JavaScript Prototype JS Types JavaScript Array JS Multidimensional Array JavaScript String JavaScript for...in loop Ja...
outloop : for (i in document) { switch (i.toString()) { case "bgColor" : document.write("document." + i + "=" + document[i] + ""); break outloop; default : document.write("没有找到"); } } 1. 2. 3. 4. 5. 6. ...
JS有几种循环语句: for for...in for...of(ES6 IE不支持) while do...while for each...in[2] (已废弃,不述) for await...in[3](异步,暂不述) ▉while[4] 语法: while (condition) statement 条件为真时执行语句,如此往复,直到条件为假。 多行语句可以用大括号包裹。 ▉do...while[5] 语法...
如果i是挂在全局上的,因为他每次loop完都要从全局中找回i值,i++ 和 判断 而封装在 function里面的,对比与在全局里找i,单单在function 里找起来比较快 ——《javascript循环时间判断优化!》 从性能上考量,我从eslint上禁止 for in。 之前在gem代码重构的过程中,讲了很多次 for in for map foreach等遍历情...