JavaScript旋转动画

Question

I am stuck at a point.There are 10 straight lines(png image).What I want is after the first line rotates by 40 deg,then the second line should start its rotaion and then the third,fourth,fifth and so on!!!

code:

<div class="hair" onclick="rotate()">
    <img src="single.png" id="1" width="10" height="40">
    <img src="single.png" id="2" width="10" height="40">
    <img src="single.png" id="3" width="10" height="40">
    <img src="single.png" id="4" width="10" height="40">
    <img src="single.png" id="5" width="10" height="40">
    <img src="single.png" id="6" width="10" height="40">
    <img src="single.png" id="7" width="10" height="40">
    <img src="single.png" id="8" width="10" height="40">
    <img src="single.png" id="9" width="10" height="40">
    <img src="single.png" id="10" width="10" height="40">
</div>

Javascript:

function rotate(){
    for(var i=1;i<11;i++)
    {
        setInterval(function(){
            document.getElementById(i).style.WebkitTransitionDuration="1s";
            document.getElementById(i).style.webkitTransform = 'rotate(40deg)';
        },100)
    }
}

Answer 1

You're encountering the classic scope/closure/reference problem most people run into when using anonymous functions. I've answered this question a while back, and provided tons of info on what is actually happening ( Ignore the first paragraph of my answer, the rest of the answer is applicable, though ). Meanwhile, the answer to your problem is:

for(var i=1;i<11;i++)
{
    setInterval((function(myI)
    {
        return function()
        {
            document.getElementById(myI).style.WebkitTransitionDuration='1s';
            document.getElementById(myI).style.webkitTransform = 'rotate(40deg)';
        };
    }(i)),100);
}

Be aware that you're setting intervals: the callback will be called every 100ms as long as the browser window remains open.
You're not storing the interval id anywhere, so I'd either use setTimeout or create a (preferably non-global) array of id's so you can do clearInterval(intervalID[x]); when you need to.

Answer 2

I would do it like this on modern browsers, separating CSS and JS by using a class. This is my own example based on your requirements, using a common class box and modern tools and patterns:

Here's the HMTL, I'm using divs just because, but you can use images or any other element:

<div class="container">
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
</div>

Keep the CSS separate, you just need to match the transition speed with the delay:

.box {
  width: 100px;
  height: 100px;
  margin: 40px;
  background: grey;
  -webkit-transition: -webkit-transform .3s linear;
}

.box.rotate {
  -webkit-transform: rotate(45deg);
}

And the JS:

function rotate() {
  var elements = document.querySelectorAll('.box');
  [].forEach.call(elements, function(element, i) {
    setTimeout(function(){ element.classList.add('rotate'); },i*300);
  });
}

document.querySelector('.container')
        .addEventListener('click',rotate);

Here's little demo: http://jsbin.com/ofiral/1/edit

Answer 3

There are a couple of steps to solve your problem:

An ID in HTML cannot start with a number, so rename them to something like 'hair1', 'hair2', etc.

The main problem is that because of the setInterval, by the time the function runs, i will not be the i that you were expecting. This is because of variable scope. You can get around this with an anonymous function.

Combining both of the above gives this code:

<div class="hair" onclick="rotate()">
  <img src="single.png" id="hair1" width="10" height="40">
  <img src="single.png" id="hair2" width="10" height="40">
  <!-- etc -->
</div>

// NOTE: This is not the final code listing, see below for a final answer. 
for (var i = i; i < 11; i++) {
  (function(local_i) {
    setInterval(function () {
      // use local_i instead of i inside this function for the results you expect
      document.getElementById('hair' + local_i).style.WebkitTransitionDuration='1s';
      document.getElementById('hair' + local_i).style.webkitTransform = 'rotate(40deg)';
    }, 100);
  })(i);
}

I would also recommend putting the styles into a stylesheet, then apply them using a class:

.rotate
{
  -webkit-transform: rotate(40deg);
  -webkit-transition: -webkit-transform 1s;
}

Finally, to get the elements to rotate in a row rather than all together, you need to multiply the interval by the value of i . I think that you probably mean to use setTimeout rather than setInterval (setInterval will keep running over and over again).

function rotate(){
  for(var i=1;i<11;i++) {
    (function (local_i) {
      setTimeout(function(){
        document.getElementById('hair' + local_i).classList.add('rotate');
      }, 100 * local_i);
    })(i);
  }
}

I've put together a demo here

Answer 4

Not a perfect solution, but something you can start with.

Define a css3 animation and assign it using javascript.

@-webkit-keyframes rotation {
    from {
        -webkit-transform: rotate(0deg);
    }
    to {
        -webkit-transform: rotate(360deg);
    }
}
.hair {
    position:relative;
}
.hair div {
    width:40px;
    height:40px;
    border-bottom: 1px solid #000;
    position:absolute;
    -webkit-animation-duration:         1s; 
    -webkit-animation-iteration-count:  infinite;
    -webkit-animation-timing-function: linear;
}

.

function rotate() {
    for (var i = 1; i < 11; i++) {
        (function (x) {
            setInterval(function () {
                document.getElementById("d" + x).style.WebkitAnimationName = "rotation";
            }, 200 * i);
        })(i);
    }
}

rotate();

adjust the setInterval dealy and animation-duration to get the desired result.

webkit demo: http://jsfiddle.net/NQJJp/5/