Notice that the condition statement is i <= n; in order to include the n itself as well. Inside the for loop, we multiply the current value of result with the current value of our index i - performing the operation from the definition in reverse. Finally, we return the final value of...
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for-in 语句 for 语句是严格的迭代语句,用于枚举对象的属性。 它的语法如下: for (property in expression) statement 例子: for (sProp in window) { alert(sProp); } 这里,for-in 语句用于显示 window 对象的所有属性。 前面讨论过的 PropertyIsEnumerable() 是 ECMAScript 中专门用于说明属性是否可以用 for...
statement:需执行的语句。如果要执行多条语句,就要用中括号({...})把语句括起来 [incrementExpression]:累计表达式。若存在则执行,然后会回到第2步执行语句 例子 function howMany(selectObject) { var numberSelected = 0; for (var i = 0; i < selectObject.options.length; i++) { if (selectObject...
for-in 语句 for 语句是严格的迭代语句,用于枚举对象的属性。 它的语法如下: </>code for(propertyinexpression)statement 例子: </>code for (sProp in window) { alert(sProp); } 这里,for-in 语句用于显示 window 对象的所有属性。 前面讨论过的 PropertyIsEnumerable() 是 ECMAScript 中专门用于说明属性...