缓存变量:DOM遍历是昂贵的,所以尽量将会重用的元素缓存。
$element = $('#element');
h = $element.height(); //缓存
$element.css('height',h-20);
如果你打算对DOM元素做大量操作(连续设置多个属性或css样式),建议首先分离元素然后在添加。
使用var与匈牙利命名法,且避免全局变量 ;
优化选择符;避免多个ID选择符
ajax:
- 使用相关函数:
$("#file").on("click","button",function() {
$.ajax("confirmation.html",{
data: {"confNum":1234},
success: function(res) {},
error: function(req,errorType,errorMessage) {},
timeout:3000,
beforeSend: function() {
$(".confirmation").addClass('is-loading');
},
complete: function() {
$(".confirmation").removeClass("is-loading");
}
})
}); - 提交表单:
$("form").on("submit",function(event) {
event.preventDefault(); //submit will reflash the page
var form = $(this);
$.ajax("/book", {
type: "POST",
data: form.serialize(), //use this;
success: function(result) {
form.remove();
$("#vacation").hide().html(result).fadeIn();
}
});
}); - 优化操作:
$.ajax('/test.html')
.done(function(res) {console.log(res,'done1');})
.fail(function(res) {console.log(res,'fail');}) - 要多个ajax共同使用的时候
$.when($.ajax("test1.html"),$.ajax("test2.html"))
.done(function(res) {console.log(res,'done');})
.fail(function(res) {console.log(res,'fail');}); //都成功才会执行done;返回第一个ajax的res;
写插件:
- html:
<div class="container">
<div class="col-sm-12 top">
<button id="all" class="btn btn-primary col-sm-offset-10 show-price">show all</button>
</div>
<div class="jumbotron col-sm-3 vacation" data-price="110">
<h4>Hawaiian Vaction</h4>
<button class="click btn btn-info">SHOE PRICE</button>
<p class="no-hide"><a href="#" class="remove-vacation">no thanks!</a></p>
</div> <div class="jumbotron col-sm-3 col-sm-offset-1 vacation" data-price="150">
<h4>European Getaway</h4>
<button class="click btn btn-info">SHOE PRICE</button>
<p class="no-hide"><a href="#" class="remove-vacation">no thanks!</a></p>
</div> <div class="jumbotron col-sm-3 col-sm-offset-1 vacation" data-price="90">
<h4>Visit Japan</h4>
<button class="click btn btn-info">SHOE PRICE</button>
<p class="no-hide"><a href="#" class="remove-vacation">no thanks!</a></p>
</div>
</div> - js:
$.fn.pricefy = function(options) {
this.each(function() {
//使用$.extend添加属性;setting为要操作的数据集合
var settings = $.extend({
days: 3,
vacation: $(this),
price: $(this).data("price")
},options);
var show = function() {
var details = $("<p>Book" + settings.days +"days for $" + (settings.days * settings.price)+ "</p>");
settings.vacation.find(".click").hide();
settings.vacation.append(details);
};
var remove = function() {
settings.vacation.hide().off(".pricefy");
};
settings.vacation.on("click.pricefy","button",show);
settings.vacation.on("show.pricefy",show);
settings.vacation.on("click.pricefy",".remove-vacation",remove);
})
}; $(function() {
$(".vacation").pricefy();
$(".show-price").on("click",function(event) {
event.preventDefault();
$(".vacation").trigger('show.pricefy');
});
});