Local Call Watercress API

Call the Watercress API, error
XMLHttpRequest cannot load https://api.douban.com/v2/book/search?q=%E7%94%B5%E6%9C%BA%E5%AD%A6&count=10. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://mytest' is therefore not allowed access.
Just started to learn PHP, the thigh to help solve

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Js

$('#go').click(function(){        if($('input').val()==''){            alert("请输入关键词");        }else{            var sq=$('input').val();            $.ajax({                type:"GET",                url:"https://api.douban.com/v2/book/search",                dataType:"json",                data:{                    q:sq,                    count:10                },                success:function(data){                    $.each(data.books, function(i,book) {                        $("#showbook").append("
"); }); }, }); } });

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Call the Watercress API, error
XMLHttpRequest cannot load https://api.douban.com/v2/book/search?q=%E7%94%B5%E6%9C%BA%E5%AD%A6&count=10. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://mytest' is therefore not allowed access.
Just started to learn PHP, the thigh to help solve

Page

搜索
  
   

Js

$('#go').click(function(){        if($('input').val()==''){            alert("请输入关键词");        }else{            var sq=$('input').val();            $.ajax({                type:"GET",                url:"https://api.douban.com/v2/book/search",                dataType:"json",                data:{                    q:sq,                    count:10                },                success:function(data){                    $.each(data.books, function(i,book) {                        $("#showbook").append("
"); }); }, }); } });

I just did a little search. Ajax cross-domain issues, and now I'm thinking of using the JSONP format, and then adding the server side
Header ("Access-control-allow-origin: *"); # Cross-domain processing

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