<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<!-- 手指在滑動整個屏幕時，會影響瀏覽器的行爲，比如滾動和縮放。所以在調用touch事件時，要注意禁止縮放和滾動 -->
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<style>
/* 滑動控件容器,亮灰色背景 */
#dragContainer {
position: relative;
display: inline-block;
background: #e8e8e8;
width: 300px;
height: 40px;
border: 2px solid #e8e8e8;
/** 下面兩行用來讓控件整體水平居中（不需要可刪）*/
left: 50%;
transform: translate(-50%);
}
/* 滑塊左邊部分,綠色背景 */
#dragBg {
position: absolute;
background-color: #7ac23c;
width: 0px;
height: 100%;
}
/* 滑動驗證容器文本 */
#dragText {
width: 100%;
height: 100%;
/** absolute是爲了讓它不佔地方 */
position: absolute;
/** flex佈局可以讓它居中 */
display: flex;
align-items:center;
justify-content: center;
/* 文本不允許選中 */
user-select: none;
-webkit-user-select: none;
}
/* 滑塊 */
#dragHandler {
position: absolute;
width: 50px;
height: 100%;
cursor: move;
}
/* 滑塊初始背景 */
.dragHandlerBg {
background: #fff no-repeat center url("data:image/png;base64,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");
}
/* 驗證成功時的滑塊背景 */
.dragHandlerOkBg {
background: #fff no-repeat center url("data:image/png;base64,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");
}
</style>
<script>
window.onload = function() {
var dragContainer = document.getElementById("dragContainer");
var dragBg = document.getElementById("dragBg");
var dragText = document.getElementById("dragText");
var dragHandler = document.getElementById("dragHandler");
//滑塊最大偏移量
var maxHandlerOffset = dragContainer.clientWidth - dragHandler.clientWidth;
//是否驗證成功的標記
var isVertifySucc = false;
initDrag();
function initDrag() {
dragText.textContent = "拖動滑塊驗證";
dragHandler.addEventListener("mousedown", onDragHandlerMouseDown);
dragHandler.addEventListener("touchstart", onDragHandlerMouseDown);
}
function onDragHandlerMouseDown(event) {
document.addEventListener("mousemove", onDragHandlerMouseMove);
document.addEventListener("mouseup", onDragHandlerMouseUp);
document.addEventListener("touchmove", onDragHandlerMouseMove);
document.addEventListener("touchend", onDragHandlerMouseUp);
}
function onDragHandlerMouseMove(event) {
/*
html元素不存在width屬性,只有clientWidth
offsetX是相對當前元素的,clientX和pageX是相對其父元素的
touches：表示當前跟蹤的觸摸操作的touch對象的數組。
targetTouches：特定於事件目標的Touch對象的數組。
changedTouches：表示自上次觸摸以來發生了什麼改變的Touch對象的數組。
*/
//特別注意：由於translate(-50%)，所以實際的left比屬性中的offsetLeft要左50%
var left = (event.clientX || event.changedTouches[0].clientX) - dragHandler.clientWidth / 2 - dragContainer.offsetLeft + dragContainer.clientWidth / 2;
console.log(event.clientX, dragContainer.offsetLeft);
console.log(event)
if(left < 0) {
left = 0;
} else if(left > maxHandlerOffset) {
left = maxHandlerOffset;
verifySucc();
}
dragHandler.style.left = left + "px";
dragBg.style.width = dragHandler.style.left;
}
function onDragHandlerMouseUp(event) {
document.removeEventListener("mousemove", onDragHandlerMouseMove);
document.removeEventListener("mouseup", onDragHandlerMouseUp);
document.removeEventListener("touchmove", onDragHandlerMouseMove);
document.removeEventListener("touchend", onDragHandlerMouseUp);
dragHandler.style.left = 0;
dragBg.style.width = 0;
}
//驗證成功
function verifySucc() {
isVertifySucc = true;
dragText.textContent = "驗證通過";
dragText.style.color = "white";
dragHandler.setAttribute("class", "dragHandlerOkBg");
dragHandler.removeEventListener("mousedown", onDragHandlerMouseDown);
document.removeEventListener("mousemove", onDragHandlerMouseMove);
document.removeEventListener("mouseup", onDragHandlerMouseUp);
dragHandler.removeEventListener("touchstart", onDragHandlerMouseDown);
document.removeEventListener("touchmove", onDragHandlerMouseMove);
document.removeEventListener("touchend", onDragHandlerMouseUp);
};
}
</script>
</head>
<body>
<div id="dragContainer">
<div id="dragBg"></div>
<div id="dragText"></div>
<div id="dragHandler" class="dragHandlerBg"></div>
</div>
</body>
</html>
js實現滑動驗證
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