jQuery每个循环返回两次数据

时间:2015-03-10 03:48:38

标签: javascript jquery jquery-animate each

请在下面玩小提琴。一个错误应该发生 - 转变它的#34; head"然后朝正确的方向爬行。但是几个错误(从两个向上开始)会破坏它们。 Jquery"每个"返回坐标两次,因此生成两个错误而不是两组坐标。

$(document).ready(function () {


    function bug() {
        $('.bug').each(function () {
            //var bugs = $('.bug').length;

            var h = $(window).height() / 2;
            var w = $(window).width() / 2;
            var nh = Math.floor(Math.random() * h);
            var nw = Math.floor(Math.random() * w);



            //$this = $(this);
            //var newCoordinates = makeNewPosition();
            var p = $(this).offset();
            var OldY = p.top;
            var NewY = nh;

            var OldX = p.left;
            var NewX = nw;

            var y = OldY - NewY;
            var x = OldX - NewX;
            angle = Math.atan2(y, x);
            angle *= 180 / Math.PI
            angle = Math.ceil(angle);

            console.log(p);

            $(this).delay(1000).rotate({
                animateTo: angle
            });



            $(this).animate({
                top: nh,
                left: nw
            }, 5000, "linear", function () {
                bug();
            });

        });
    };

    bug();
});

http://jsfiddle.net/p400uhy2/
http://jsfiddle.net/p400uhy2/4/

2 个答案:

答案 0 :(得分:3)

@Noah B 所述,问题是每个" bug" 正在为所有"设置循环。错误"

我为每个元素设置bug()个功能,以便每个"错误" 可以单独设置。

编辑 @Roko C. Buljan 评论)

function bug() {
    // ... your code ...

    // calculate animation time, so that each of bugs runs same fast in long and short distance:
    var top_diff = Math.abs(OldY - nh),
        left_diff = Math.abs(OldX - nw),
        speed = Math.floor(Math.sqrt((top_diff * top_diff) + (left_diff * left_diff))) * 15;

    $(this).animate({
        top: nh,
        left: nw
    }, speed, "linear", function () {
        // rerun bug() function only for that single element:
        bug.call(this);
    });
};

$('.bug').each(bug);

DEMO

答案 1 :(得分:1)

问题是你有.each()用.each()调用一个函数...所以每个bug都有bug()回调。您只需将bug()调用移到.each(){}之外。请参阅小提琴:http://jsfiddle.net/p400uhy2/2/