Html
代码语言：javascript复制<button id="btnFS" class="btn btn-success" >开始体验</button>Js
代码语言：javascript复制var flag, btnEle, cur, nx, ny, dx, dy, x, y;
flag = false;
btnEle = document.getElementById("btnFS");
cur = {x: 0,y: 0 };
function down() {
var touch = event.touches[0];
flag = true;
cur.x = touch.clientX;
cur.y = touch.clientY;
dx = btnEle.offsetLeft;
dy = btnEle.offsetTop;
}
function move(){
if(flag){
var touch = event.touches[0];
nx = touch.clientX - cur.x;
ny = touch.clientY - cur.y;
x = dx nx;
y = dy ny;
if(Math.abs(nx)) {
event.preventDefault();
}
if (x<=0) {
x = 0;
} else if(x>=btnEle.parentNode.offsetWidth - btnEle.offsetWidth) {
x = btnEle.parentNode.offsetWidth - btnEle.offsetWidth;
} else {
x = x;
}
if (y<=0) {
y = 0;
} else if(y>=btnEle.parentNode.offsetHeight - btnEle.offsetHeight) {
y = btnEle.parentNode.offsetHeight - btnEle.offsetHeight;
} else {
y = y;
}
btnEle.style.left = x "px";
btnEle.style.top = y "px";
}
}
function end(){
flag = false;
}
btnEle.addEventListener("touchstart",function(){
down();
},false);
btnEle.addEventListener("touchmove",function(){
move();
},false);
btnEle.addEventListener("touchend",function(){
end();
},false);
btnEle.addEventListener("click", function(event) {
if (!$scope.isFull) {
document.querySelector('.col-md-3').style.display = 'none';
document.querySelector('.invite').style.display = 'none';
document.querySelector('#matters').classList = 'hidden';
this.innerText = "退出体验";
$scope.isFull = true;
} else {
document.querySelector('.col-md-3').style.display = 'block';
document.querySelector('.invite').style.display = 'block';
document.querySelector('#matters').classList = 'visible-xs visibile-sm';
this.innerText = "开始体验";
$scope.isFull = false;
}
});
