dabeng
load data on-demand
hello, Web Components,I Just debugged on-demand loading logic and found something wrong. The code is as follows： _getJSON(url) { return new Promise(function (resolve, reject) { let xhr = new XMLHttpRequest();
function handler() { if (this.readyState !== 4) { return; } if (this.status === 200) { resolve(JSON.parse(this.response)); } else { reject(new Error(this.statusText)); } } xhr.open('GET', url); xhr.onreadystatechange = handler; xhr.responseType = 'json'; // xhr.setRequestHeader('Accept', 'application/json'); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.send(); }); } Now that xhr. setRequestHeader ('Content - Type', application / json') is set, the return data does not have to be processed by JSON. parse (this. response). Otherwise, what do you think?
