


Detailed explanation of the steps to obtain and load JSON data through JS
This time I will give you a detailed explanation of the steps to obtain and load JSON data through JS. What are the precautions for obtaining and loading JSON data through JS? The following is a practical case, let's take a look.
Detailed explanation of the steps to obtain and load JSON data through JS When writing pages with repetitive content logic, using json data can significantly improve programming efficiency and facilitate later data processing maintain. Therefore, on the video topic page, multiple columns of video data need to be displayed, and I chose to use json. The HTML is as follows (only the key parts are shown, JQ needs to be cited)<p class="container-fluid content "> <p class="container neirong"> <p class="left fl"> <p class="title"> 热门视频 </p> <p class="medialist"> </p> </p></p> </p>
<script> $(document).ready(function(){ console.log(1111) $.getJSON('data.json',function(data){ console.log(222) var mediahtml=""; $.each(data,function(i,data) { mediahtml+='<p class="media">'+ '<p class="media-left">'+ '<a data-toggle="modal" data-target="#myModal">'+ '<img class="media-object" src="'+data["imgsrc"]+ '" alt="">'+ '</a>'+'</p>'+ '<p class="media-body">'+ '<p class="title">'+ '<span class="classify">'+ data["classify"]+ '</span>'+ '<span class="titlename media-heading">'+ data['titlename']+ '</span>'+ '</p>'+ '<span class="time">'+ '<span class="glyphicon glyphicon-time"></span> '+ '<span>'+data['pubdate']+'</span>'+ '<p>'+data["intro"]+'</p>'+ '<p class="guest">'+ '<span class="jia">嘉</span>'+ '<span class="name">'+data["name"]+'</span>'+ '<span class="position">'+data["position"]+'</span>'+ '<span class="glyphicon glyphicon-eye-open"></span>'+ '<span class="click-rite"></span>'+ '</p>'+ '</p>'+ '<p class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">'+ '<p class="modal-dialog" role="document">'+ '<p class="modal-content">'+ '<p class="modal-header">'+ '<button type="button" class="close" data-dismiss="modal" aria-label="Close">'+ '<span aria-hidden="true">×</span>'+ '</button>'+ '</p>'+ '<p class="modal-body"></p>'+ '</p>'+ '</p>'+ '</p>' // var url_mobi=data.url_mobi; // var url_pc=data.url_pc; // if ((navigator.userAgent.match(/(iPhone|iPod|Android|ios|iOS|iPad|Backerry|WebOS|Symbian|Windows Phone|Phone)/i))) { // $('.modal-body').prepend(url_mobi); // }else{ // $('.modal-body').prepend(url_pc); // } }) $('.medialist').after(mediahtml); }) }) $('#myModal').on('shown.bs.modal', function (e) { // 关键代码,如没将modal设置为 block,则$modala_dialog.height() 为零 $(this).css('display', 'block'); var modalHeight = $(window).height() / 2 - $('#myModal .modal-dialog').height() / 2; $(this).find('.modal-dialog').css({ 'margin-top': modalHeight }); }); //点击预览图时判断 // $('.modal').on('click', function () { // if ($('#myModal').css("display") == "none") { // $('.modal-body').children('iframe').attr('src', ''); // } else { // $('.modal-body').children('iframe').attr('src', // 'https://v.qq.com/iframe/player.html?vid=v0508nqkm75&tiny=0&auto=0'); // } // }) </script>
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Performance optimization methods for converting PHP arrays to JSON include: using JSON extensions and the json_encode() function; adding the JSON_UNESCAPED_UNICODE option to avoid character escaping; using buffers to improve loop encoding performance; caching JSON encoding results; and considering using a third-party JSON encoding library.

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PHP arrays can be converted to JSON strings through the json_encode() function (for example: $json=json_encode($array);), and conversely, the json_decode() function can be used to convert from JSON to arrays ($array=json_decode($json);) . Other tips include avoiding deep conversions, specifying custom options, and using third-party libraries.

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PHP provides the following functions to process JSON data: Parse JSON data: Use json_decode() to convert a JSON string into a PHP array. Create JSON data: Use json_encode() to convert a PHP array or object into a JSON string. Get specific values of JSON data: Use PHP array functions to access specific values, such as key-value pairs or array elements.
