前端之路——jQuery第四課(結合所學知識,製作一個具有jq特效的導航欄)
新課內容:
1.與&&、或||、非!(邏輯判斷->和布林值有關係),這與或非,,,
2.與或非的運算級
3.何為+=?何為-=
4.駝峰寫法!!(例子:MaiZhanHao)
5.callback(回撥函式)
6.alter彈窗
7.jq特效:顯示/隱藏/彈出/彈入/滑動,語法:
div_1.click(function(){
div_2.slideDown();
});
div_2.click(function(){
div_2.slideUp('slow', function() {
});
8.動畫(重點)animate,上圖,上程式碼(滑鼠移入div,div會向左滑動後返回原位)
;$(function(){
var ul = $('.ul'),
a = $('.a'),
b = $('.b'),
c = $('.c'),
d = $('.d'),
e = $('.e'),
f = $('.f'),
g = $('.g');
// ul.click(function() {
// window.location.href="https://www.baidu.com";
// });
a.mouseenter(function(){
a.animate({right: 28},320)
.animate({left: 5},320)
});
b.mouseenter(function(){
b.animate({right: 120},300)
.animate({left: 5},300)
});
c.mouseenter(function(){
c.animate({right: 200},280)
.animate({left: 5},280)
});
d.mouseenter(function(){
d.animate({right: 300},260)
.animate({left: 5},260)
});
e.mouseenter(function(){
e.animate({right: 400},240)
.animate({left: 5},240)
});
f.mouseenter(function(){
f.animate({right: 480},220)
.animate({left: 5},220)
});
g.mouseenter(function(){
g.animate({right: 580},200)
.animate({left: 5},200)
});
});
你看到後,你會覺得我真是個前端小白,,,,,,
問題在於很多能優化的語句都被我複雜化了。,老師一眼就看出來了。。。。。。。這麼多行程式碼,,,,
優化版:
// 文件就緒事件
;$(function(){
var ul = $('.ul'),
a = $('.a'),
b = $('.b'),
c = $('.c'),
d = $('.d'),
e = $('.e'),
f = $('.f'),
g = $('.g');
function showDiv (dom,value){
dom.mouseenter(function(){
dom.animate({right: value})
.animate({right: 0})
});
}
showDiv(a,30);
showDiv(b,120);
showDiv(c,200);
showDiv(d,300);
showDiv(e,400);
showDiv(f,480);
showDiv(g,580);
});
今天還有個重要的知識電:鏈式寫法,語法:
div_1.click(function(){
div_1.animate({top: 400},2000).animate({right: 400}, 2000).click(function() {alert(1);});
});
還有!!!!!福利到!!!!
http://www.jq22.com/
你開啟後會感覺到jq的強大,,,,,