increment

问题 I'm trying to make a slider that changes the margin-left attribute in the external css onclick. So I need to get the attribute and then set the new attribute. here is my code: <style> #divName { margin-left:20px; } </style> <script language="javascript" type="text/javascript"> var x = document.getElementById(divName); if (x.currentStyle) { var y = x.currentStyle[marginLeft]; } else (window.getComputedStyle) { var y = document.defaultView.getComputedStyle(x,null).getPropertyValue(marginLeft);

问题 My assignment is to write a recursive function to multiply two numbers together, using only an addition function, ++ , and -- . My addition function is: public static int peanoplus(int x, int y) { if(y==0) return x; else return peanoplus(++x,--y); } What I have so far for my multiplication function is: public static int peanotimes(int x, int y) { if(y==0) return x; else return peanotimes(peanoplus(x,x),--y); } I am not exactly sure what to put in the first parameter for the peanotimes

问题 I wish to cycle the values of a variable (call it x ) through the pattern 0, 1, 2, 0, 1, 2, … upon activation of a function (call it update ). I've managed to get 1, 2, 0, 1, 2, 0, … by doing: var x = 0; function update() { x = ++x % 3; } Then I tried the post-increment operator instead, and the value of x just remains at 0: var x = 0; function update() { x = x++ % 3; } Then the more I thought about this code, the more confused I got. I think 0 modulo 3 is being done first, then the

问题 I thought of a while loop but cant find the way around this: $foo1 = get_post_meta( $post->ID, '_item1', true ); if (!empty($foo1)){ echo ("<div class='$foo1'></div>"); } $foo2 = get_post_meta( $post->ID, '_item2', true ); if (!empty($foo2)){ echo ("<div class='$foo2'></div>"); } And so on... for a hundred times until I reach $foo100 and _item100 Any idea to achieve this to not repeat these 4 lines over and over? 回答1: You don't need variable variables for that, but just a for loop like this:

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: PHP: “Notice: Undefined variable” and “Notice: Undefined index” Recently turned on errors and I'm catching the Undefined Index and Undefined Offset error on lines I'm incrementing to a new array index. Here's a very basic example. for($i = 0; $i<10; $i++) { $arr['var1'] += $val1[$i]; $arr['var2'] += $val2[$i]; } I'm getting the error because on the first iteration $arr['var1'] isn't set. I've found that both

问题 I recently have been taking advantage of the <numeric> iota statement for incrementing a vector of type int . But now I am trying to use the statement for incrementing an explicit class with 2 members. So here is the usage with a vector of integers: vector<int> n(6); iota(n.begin(), n.end(), 1); Given that Obj class has an integer member called m . The constructor initializes m to its corresponding integer argument. Here is what I am trying to do now: vector<Obj> o(6); iota(o.begin(), o.end()

问题 I have a html script with a javascript variable inside it, this variable I have then passed to a php file, to increment it by 1. My problem is that I don't know how I would then pass it back to the html file, to then display it, also I don't know how the variables work on a website, if I have to save the variable in some sort of way to make sure it is the same updated variable as when I left the site. html script: <script type="text/javascript"> var nrVar= 1; document.getElementById("nrVar")

问题 I am using a form that is pulling data from two MySQL databases into a single dynamic page. When a user clicks add to cart I want to store that data in a multi dimensional session array to call up later when they click view cart. I am wondering how to auto increment the subset identifier(array key?) of the item when a new item is added from the add to cart form. This is what I have so far: $newitem = array ($row_getimages['icon'],$row_getimages['title'],$row_getshoppingcart['medium'],$row

问题 Help me to resolve this please. The steps that follows that expressions are: //Expression offSpring1[m1++] = temp1; //Steps: 1.- increment m1 2.- assign temp1 to offSpring I have always thought that the expression inside the brackets was the first to be done. But now I am confuse. So if a write this: //Expression offSpring1[++m1] = temp1; //Steps would be: 1.- assign temp1 to offSpring 2.- increment m1 If the steps would be the same as first ones, what is the difference between i++ and ++i?

问题 I have a table holding customer invoice data. I am trying to find how many consequently months a particular transaction type is present on a customer’s invoice by creating a carryover counter. If the transaction is no longer present, the counter should reset to zero. Table: +------------+-------------+----------------+----------+ | Invoice_Id | Customer_id | Transaction_id | Sequence | +------------+-------------+----------------+----------+ | 253442 | 23334 | | 1 | | 253443 | 23334 | | 2 | |