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JavaScript Promises 对象
tryjs_promise2
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<!DOCTYPE html> <html> <body> <h2>JavaScript 承诺</h2> <p id="demo"></p> <script> function myDisplayer(some) { document.getElementById("demo").innerHTML = some; } let myPromise = new Promise(function(myResolve, myReject) { let x = 0; // some code (try to change x to 5) if (x == 0) { myResolve("OK"); } else { myReject("Error"); } }); myPromise.then( function(response) {myDisplayer(response);}, function(error) {myDisplayer(error);} ); </script> </body> </html>