javascript 滑动验证仿淘宝滑动验证

html:

<div id="dragContainer">
              <div id="dragBg"></div>
              <div id="dragText"></div>
              <div id="dragHandler" class="dragHandlerBg"></div>
            </div>

css:

背景 */
#dragBg {
    position: absolute;
    background-color: #2f99fb;
    width: 0;
    height: 100%;
}
/* 滑动验证容器文本 */
#dragText {
    position: absolute;
    width: 100%;
    height: 100%;
    /* 文字水平居中 */
    text-align: center;
    /* 文字垂直居中,这里不能用百分比,因为百分比是相对原始line-height的,而非div高度 */
    line-height: 42px;
    /* 文本不允许选中 */
    user-select: none;
    -webkit-user-select: none;
}
/* 滑块 */
#dragHandler {
    position: absolute;
    width: 40px;
    height: 40px;
    cursor: move;
}
/* 滑块初始背景 */
.dragHandlerBg {
    border: 1px solid #ddd;
    background: #fff no-repeat center url("data:image/png;base64,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");
}
/* 验证成功时的滑块背景 */
.dragHandlerOkBg{
    border: 1px solid #2f99fb;
    background: #fff url("../images/toggle.png") no-repeat center;
}

javascript：

window.onload = function() {
  var dragContainer = document.getElementById("dragContainer");
  var dragBg = document.getElementById("dragBg");
  var dragText = document.getElementById("dragText");
  var dragHandler = document.getElementById("dragHandler");

  //滑块最大偏移量
  var maxHandlerOffset = dragContainer.offsetLeft + dragContainer.offsetWidth - dragHandler.offsetWidth;
  //是否验证成功的标记
  var isVertifySucc = false;
  initDrag();

  function initDrag() {
    dragText.textContent = "拖动滑块验证";
    dragHandler.addEventListener("mousedown", onDragHandlerMouseDown);
  }

  function onDragHandlerMouseDown() {
    document.addEventListener("mousemove", onDragHandlerMouseMove);
    document.addEventListener("mouseup", onDragHandlerMouseUp);
  }

  function onDragHandlerMouseMove() {
    /*
    html元素不存在width属性,只有clientWidth
    offsetX是相对当前元素的,clientX和pageX是相对其父元素的
    */
    var left = event.clientX - dragHandler.clientWidth / 2;
    console.log(event.clientX);
    if(left < dragContainer.offsetLeft) {
      left = dragContainer.offsetLeft;
    } else if(left > maxHandlerOffset) {
      left = maxHandlerOffset;
      verifySucc();
    }
    dragHandler.style.left = left - dragContainer.offsetLeft + "px";
    dragBg.style.width = dragHandler.style.left;
  }

  function onDragHandlerMouseUp() {
    document.removeEventListener("mousemove", onDragHandlerMouseMove);
    document.removeEventListener("mouseup", onDragHandlerMouseUp);
    dragHandler.style.left = 0;
    dragBg.style.width = 0;
  }

  //验证成功
  function verifySucc() {
    isVertifySucc = true;
    dragText.textContent = "验证通过";
    dragText.style.color = "white";
    dragHandler.setAttribute("class", "dragHandlerOkBg");
    dragHandler.removeEventListener("mousedown", onDragHandlerMouseDown);
    document.removeEventListener("mousemove", onDragHandlerMouseMove);
    document.removeEventListener("mouseup", onDragHandlerMouseUp);
  }
}

实现样式：

参考：http://blog.csdn.net/chy555chy/article/details/55294147

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