functiontouch(selector) {
if(selector.indexOf("#")>=0) {
vardiv1=document.getElementById(selector.split("#")[1]);
}
if(selector.indexOf(".")>=0) {
vardiv1=document.getElementsByClassName(selector.split(".")[1])[0];
}
div1.style.position="absolute";
vardistanceX;
vardistanceY;
div1.addEventListener("touchstart",function(e) {
//获取按下鼠标到div left top的距离
distanceX=e.touches[0].clientX-div1.offsetLeft;
distanceY=e.touches[0].clientY-div1.offsetTop;
})
div1.addEventListener("touchmove",function(e) {
varoEvent=e.touches[0]||event;
//重新计算div的left top值
varleft=oEvent.clientX-distanceX;
vartop=oEvent.clientY-distanceY;
//left 当小于等于零时，设置为零 防止div拖出document之外
if(left<=0) {
left=0;
}
//当left 超过文档右边界 设置为右边界
elseif(left>=document.documentElement.clientWidth-div1.offsetWidth) {
left=document.documentElement.clientWidth-div1.offsetWidth;
}
if(top<=0) {
top=0;
}
elseif(top>=document.documentElement.clientHeight-div1.offsetHeight) {
top=document.documentElement.clientHeight-div1.offsetHeight;
}
//重新给div赋值
div1.style.top=top+"px";
div1.style.left=left+"px";
})
}
functionDrag(id) {
this.div=document.getElementById(id);
if(this.div) {
this.div.style.cursor="move";
this.div.style.position="absolute";
}
this.disX=0;
this.disY=0;
var_this=this;
this.div.onmousedown=function(evt) {
_this.getDistance(evt);
document.onmousemove=function(evt) {
_this.setPosition(evt);
}
_this.div.onmouseup=function() {
_this.clearEvent();
}
}
}
Drag.prototype.getDistance=function(evt) {
varoEvent=evt||event;
this.disX=oEvent.clientX-this.div.offsetLeft;
this.disY=oEvent.clientY-this.div.offsetTop;
}
Drag.prototype.setPosition=function(evt) {
varoEvent=evt||event;
varl=oEvent.clientX-this.disX;
vart=oEvent.clientY-this.disY;
if(l<=0) {
l=0;
}
elseif(l>=document.documentElement.clientWidth-this.div.offsetWidth) {
l=document.documentElement.clientWidth-this.div.offsetWidth;
}
if(t<=0) {
t=0;
}
elseif(t>=document.documentElement.clientHeight-this.div.offsetHeight) {
t=document.documentElement.clientHeight-this.div.offsetHeight;
}
this.div.style.left=l+"px";
this.div.style.top=t+"px";
}
Drag.prototype.clearEvent=function() {
this.div.onmouseup=null;
document.onmousemove=null;
}
// 此处调用
window.onload=function() {
touch("#div1");
newDrag("div1");
}
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