循环保存值 [英] For loop save value

问题描述

如何在for循环中保存值?这是我的问题:

How can I save value in for loop? Here my problem :

var n = $('ul#myID li').lenght;
var placetop = $('.position-for-li').offset().top;
var place = $('.position-for-li').offset().left;
for ( var y=0;y<n ;y++) {
 var pos = $('.list-update li:eq(' + y + ')').offset().left;
var postop = $('.list-update li:eq(' + y + ')').offset().top;
 var sumleft = place - pos;
 var sumtop = placetop - postop;
 alert(sumleft);
}
$('#myID li').click(function() {
     var X = $(this).prevAll().length;
     if ( X == 0) {
       $(this).animate({
          'left': test, <----- HERE VALUE FROM MY LOOP SUMLEFT
          'top' : test2 <----- HERE VALUE FROM MY LOOP SUMTOP
       });
     } else if ( X == 1) {
           $(this).animate({
          'left': test, <----- HERE VALUE FROM MY LOOP SUMLEFT
          'top' : test2  <----- HERE VALUE FROM MY LOOP SUMTOP
    } 

});

因此，在第一部分中，我想计算应该添加到左侧和顶部的像素数.然后我对我的li图像使用单击功能，它会移动到正确位置.

So in first part in want to count how much px i should add to left and top. Then i use click function to my li image and it moves to correct position.

推荐答案

循环中的return语句是一个错误.把它带到外面...

Your return statement inside the loop is a bug. Take it outside...

function myListStuff(){
    var placetop = $('.position-for-li').offset().top;
    var place = $('.position-for-li').offset().left;
    $('ul#myID li').forEach(function(li, index){
        var pos = $('.list-update li:eq(' + index + ')').offset().left;
        var postop = $('.list-update li:eq(' + index + ')').offset().top;
        var sumleft = place - pos;
        var sumtop = placetop - postop;
    })
    return sumleft
}

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