jquery教程04-常用操作

第三節(jié)常用操作目錄1.對(duì)象創(chuàng)建對(duì)象1.對(duì)象創(chuàng)建對(duì)象2.遍歷each（）迭代每一個(gè)img標(biāo)簽，為其設(shè)置src屬性，此處this為dom對(duì)象$("img").each(function(i){this.src="test"+i+".jpg";});1.遍歷如果想使用jquery對(duì)象，可以使用$(this)函數(shù)$("img").each(function(i){$(this).attr(“src”,"test"+i+".jpg");});returntrue，相當(dāng)于continue；returnfalse，相當(dāng)于break。2.遍歷遍歷數(shù)組vararr=[“one”,“two”,“three”,“four”];

$.each(arr,function(){

alert(this);

});3.遍歷varobj={one:1,two:2,three:3,four:4};

$.each(obj,function(key,val){

alert(obj[key]);

});3.ajaxAJAX即“AsynchronousJavascriptAndXML”（異步JavaScript和XML），是指一種創(chuàng)建交互式網(wǎng)頁(yè)應(yīng)用的網(wǎng)頁(yè)開(kāi)發(fā)技術(shù)。通過(guò)在后臺(tái)與服務(wù)器進(jìn)行少量數(shù)據(jù)交換，AJAX可以使網(wǎng)頁(yè)實(shí)現(xiàn)異步更新。這意味著可以在不重新加載整個(gè)網(wǎng)頁(yè)的情況下，對(duì)網(wǎng)頁(yè)的某部分進(jìn)行更新。3.ajax$.get(url,{name:"John",time:"2pm"},function(data){alert("DataLoaded:"+data);});$.post(url,{name:"John",time:"2pm"},function(data){alert("DataLoaded:"+data);});請(qǐng)求的路徑（url）傳遞的參數(shù)響應(yīng)函數(shù)回傳的值注：post和get是兩種請(qǐng)求方式3.ajax以JSON格式接收數(shù)據(jù)$.post(url，{"func":"getNameAndTime"},function(data){alert();//Johnconsole.log(data.time);//2pm},"json");4.JSONJSON(JavaScriptObjectNotation)是一種輕量級(jí)的數(shù)據(jù)交換格式。它基于ECMAScript的一個(gè)子集。格式1：鍵值對(duì){"firstName":"Brett","lastName":"McLaughlin","email":"aaaa"}格式2：數(shù)組[“張三”,”李四”,”王五”]4.JSON嵌套格式：{"employees":[{"firstName":"John","lastName":"Doe"},{"firstName":"Anna","lastName":"Sm