jquery库：
jquery -1.10.2.min.js，jQuery UI - v1.12.1。
jQuery 代码
不多说了，之间上代码。不懂的地方看注释。
获取所有表格信息
for ( var i = 0; i < TD.length; i++) {
selectedTD.push(TD[i]);
}
$("#tableDiv").mousedown(function(event) {
mouseDownX = event.clientX - $(this).offset().left;;
mouseDownY = event.clientY - $(this).offset().top;
console.log("mouseDownX=" + mouseDownX +" mouseDownY=" + mouseDownY );
if(event.target.id.match(/selected/)) {
isMove = true;
}
//鼠标按下并移动时进行判断（拖拽 or 画框）
$("#tableDiv").mousemove(function(event) {
mouseMoveX = event.clientX - $(this).offset().left;
mouseMoveY = event.clientY - $(this).offset().top;
var selectDiv = document.getElementById("selected");
if (isMove) {
//拖拽的代码，因为实在不想算 xy 了，所以使用了jquery ui
$("#selected").draggable();
//这部分是负责画框的时候，实时把框住的表格变色的，（代码和下面的代码重复了）
var left = selectDiv.offsetLeft,top = selectDiv.offsetTop; width = selectDiv.offsetWidth,height = selectDiv.offsetHeight;
for ( var i = 0; i < selectedTD.length; i++) {
var sl = selectedTD[i].offsetWidth + selectedTD[i].offsetLeft;
var st = selectedTD[i].offsetHeight + selectedTD[i].offsetTop;
if (sl > left && st > top && selectedTD[i].offsetLeft < left + width && selectedTD[i].offsetTop < top + height) {
if (selectedTD[i].className.indexOf("selected") == -1) {
selectedTD[i].className = "selected";
}
} else {
if (selectedTD[i].className.indexOf("selected") != -1) {
selectedTD[i].className = "TD";
}
}
}
} else {
//重复的代码，完了再把它抽取出来
var left = selectDiv.offsetLeft,height = selectDiv.offsetHeight;
for ( var i = 0; i < selectedTD.length; i++) {
var sl = selectedTD[i].offsetWidth + selectedTD[i].offsetLeft;
var st = selectedTD[i].offsetHeight + selectedTD[i].offsetTop;
if (sl > left && st > top && selectedTD[i].offsetLeft < left + width && selectedTD[i].offsetTop < top + height) {
if (selectedTD[i].className.indexOf("selected") == -1) {
selectedTD[i].className = "selected";
}
} else {
if (selectedTD[i].className.indexOf("selected") != -1) {
selectedTD[i].className = "TD";
}
}
}
//鼠标抬起结束画框，和拖动
$("#tableDiv").mouseup(function() {
console.log("mouseUpX=" + mouseMoveX + " mouseUpY=" + mouseMoveX);
isMove = false;
$(this).unbind('mousemove');
})
//画框
displaySelected(mouseDownY,mouseDownX,mouseMoveX,mouseMoveY);
}
})
})
//当鼠标在已经画好的框上时，改变鼠标指针样式，就是十字形了
$("#selected").mouseenter(function() {
$("#selected").css("cursor","move");
});
});
function displaySelected(mouseDownY,mouseUpX,mouseUpY) {
$("#selected").css("display","block");
$("#selected").css("top",mouseDownY);
$("#selected").css("left",mouseDownX);
var moveX = mouseMoveX - mouseDownX;
var moveY = mouseMoveY - mouseDownY;
if (moveY < 0) {
$("#selected").css("top",event.clientY - $("#table").offset().top);
}
if (moveX < 0) {
$("#selected").css("left",event.clientX - $("#table").offset().left);
}
$("#selected").css("width",Math.abs(moveX));
$("#selected").css("height",Math.abs(moveY));
}
测试用的html
使用table进行的测试：
