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前端部门开发包括哪些问题

* {

margin: 0;

padding: 0;

}

body,

width: 100%;

height: 100%;

background: black;

}

.bigBox {

width: 100%;

height: 100%;

position: relative;

display: block;

}

.drag-box {

width: 100px;

height: 100px;

background: pink;

position: absolute;

left: 50%;

top: 50%;

z-index: 5;

border-radius: 3px;

}

//拖拽、缩放

$(function () {

var $drag = $(“.bigBox”)

var $dragBox = $(“.drag-box”);

var $smdragBox = $(“.drag-box-small”);

var $cBtn = $(“.s-btn”);

var tz = 0;

var bs = 100;

var minWidth = $dragBox.outerWidth();

var maxWidth = minWidth * 3;

$(document).bind(“selectstart”, function () {

return false;

});

$dragBox.mouseover(function (e) {

$dragBox.

});

$dragBox.mousedown(function (e) {

e.preventDefault();

var positionDiv = $(this).offset();

var distenceX = e.pageX – positionDiv.left;

var distenceY = e.pageY – positionDiv.top;

$(document).mousemove(function (e) {

e.preventDefault();

var x = e.pageX – distenceX;

var y = e.pageY – distenceY;

if (x < 0) {

x = 0;

} else if (x > $drag.width() – $dragBox.outerWidth(true)) {

x = $drag.width() – $dragBox.outerWidth(true);

}

if (y < 0) {

y = 0;

} else if (y > $drag.height() – $dragBox.outerHeight(true)) {

y = $drag.height() – $dragBox.outerHeight(true);

}

$dragBox.

‘left’: x + ‘px’,

‘top’: y + ‘px’

});

});

$(document).mouseup(function () {

e.preventDefault();

$(document).unbind(‘mousemove’);

$(document).unbind(‘mouseup’);

});

}).mousewheel(function (e, d) {

if (tz >= 3 && d > 0) {

tz = 3;

return;

} else if (tz <= 0 && d < 0) {

tz = 0;

return;

}

tz += d;

var offset = $(this).offset();

var w = $(this).outerWidth();

var h = $(this).outerHeight();

var changePx = d * bs;

if (w + changePx < minWidth || w + changePx > maxWidth) {

return;

}

$dragBox.

‘width’: w + changePx + ‘px’,

‘height’: h + changePx + ‘px’,

‘left’: offset.left – changePx / 2 + ‘px’,

‘top’: offset.top – changePx / 2 + ‘px’

});

});

});