三個異步任務(wù)， 順序執(zhí)行

var step1 = function(){var def = $.Deferred();setTimeout(function(){console.log('我是第一個任務(wù)');def.resolve();},3000)return def.promise(); }var step2 = function(){var def = $.Deferred();setTimeout(function(){console.log('我是第二個任務(wù)');def.resolve();},5000)return def.promise(); }var step3 = function(){var def = $.Deferred();setTimeout(function(){console.log('我是第三個任務(wù)');def.resolve();},1000)return def.promise(); }step1().then(step2).then(step3)

三個任務(wù) 最后一個等待第一個 第二個完成后才觸發(fā)

// 異步執(zhí)行var step1 = function(){var def = $.Deferred();setTimeout(function(){console.log('我是第一個任務(wù)');def.resolve();},3000)return def.promise(); }var step2 = function(){var def = $.Deferred();setTimeout(function(){console.log('我是第二個任務(wù)');def.resolve();},1000)return def.promise(); }var step3 = function(){var def = $.Deferred();setTimeout(function(){console.log('我是第三個任務(wù)');def.resolve();},300)return def.promise(); }$.when(step1(), step2()).then(step3);

　　

轉(zhuǎn)載于:https://www.cnblogs.com/shxydx/articles/3419487.html

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