今天我們來講講有關(guān)于:“在HTML5中怎么使用json對(duì)象?”這個(gè)問題吧!下面是小編整理的相關(guān)內(nèi)容,希望對(duì)大家有所幫助!
下面通過實(shí)例代碼給大家介紹HTML5中使用json對(duì)象的方法,具體代碼如下所示:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, height=device-height, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"/>
<title>json對(duì)象用法</title>
<link rel="stylesheet" />
<script type="text/javascript" src="http://g.alicdn.com/de/prismplayer/2.6.0/aliplayer-min.js"></script>
</head>
<body>
<div class="prism-player" id="J_prismPlayer" style="position: absolute"></div>
<script>
var students = {
xiaomin: {
name: "xiaoming",
grade: 1
},
teemo: {
name: "teemo",
grade: 3
}
}
students = JSON.stringify(students); //將JSON轉(zhuǎn)為字符串存到變量里
console.log(students);
localStorage.setItem("students",students);//將變量存到localStorage里
var newStudents = localStorage.getItem("students");
newStudents = JSON.parse(students); //轉(zhuǎn)為JSON
console.log(newStudents); // 打印出原先對(duì)象
// alert(newStudents.length);
alert(newStudents.xiaomin.name);
//json數(shù)組類型字符串取值
var jsonStr = '[{"id":"01","open":false,"pId":"0","name":"A部門"},{"id":"01","open":false,"pId":"0","name":"A部門"},{"id":"011","open":false,"pId":"01","name":"A部門"},{"id":"03","open":false,"pId":"0","name":"A部門"},{"id":"04","open":false,"pId":"0","name":"A部門"}, {"id":"05","open":false,"pId":"0","name":"A部門"}, {"id":"06","open":false,"pId":"0","name":"A部門"}]';
var jsonObj = JSON.parse(jsonStr);//轉(zhuǎn)換為json對(duì)象
for(var i=0;i<jsonObj.length;i++){
alert(jsonObj[i].id); //取json中的值
}
console.log(jsonObj)
var jsonStr1 = JSON.stringify(jsonObj)
console.log(jsonStr1+"jsonStr1")
</script>
</body>
</html>
補(bǔ)充:下面看下Html5中JSON對(duì)象與String的互相轉(zhuǎn)換
面對(duì)現(xiàn)在移動(dòng)端的迅速發(fā)展,提供數(shù)據(jù)的方式不在是以前的PC-->PC界面了,這促使了JSON格式的使用,在H5以前的JS中,我在前面的一個(gè)H4中JS對(duì)JSON中的處理提到了eval方法,?eval()
? ,在H5中JSON與String的轉(zhuǎn)換如下:
String轉(zhuǎn)換為JSON對(duì)象:
var jsonObj;
function myParse(){
var jsonStr=document.querySelector("#txtJsonStr").value;
jsonObj=JSON.parse(jsonStr); }
JSON對(duì)象轉(zhuǎn)換為String:
function myStringify(){
var txtJson=document.querySelector("#txtJsonStr");
var jsonStr2=JSON.stringify(jsonObj); //此處的jsonObj 是一個(gè) JSON對(duì)象
txtJson.value=jsonStr2; }
總結(jié)
相信通過這篇文章大家對(duì)于:“在HTML5中怎么使用json對(duì)象?”這個(gè)問題應(yīng)該有所了解了吧!當(dāng)然更多有關(guān)于html5這方面的相關(guān)知識(shí)和內(nèi)容我們都可以在W3Cschool中進(jìn)行學(xué)習(xí)。