摘要：求并集union: var a = [34, 35, 45, 48, 49]; var b = [48, 55]; var union = [...new Set([...a, ...b])]; console.log(union); 方法二： var array1 = ["Vijendra", " 阅读全文

摘要：先看一个例子●vara={n:1};●varb=a;●a.x=a={n:2};●console.log("a.x:"+a.x);//返回值：a.x:undefined●console.log("a.n:"+a.n);//返回值：a.n:2●console.log("b.x:"+b.x);//返回值：b.x:[objectObject]●console.log("b.n:"+b.n);//返回值：b.n:1要点梳理●Javascript中对象的赋值是引用传递，即变量中存储的是地址而不是值。●Javascript中赋值 阅读全文

摘要：http://ued.ctrip.com/blog/?p=3121我们常用的javascript标签，有两个和性能、js文件下载执行相关的属性：defer和asyncdefer的含义【摘自https://developer.mozilla.org/En/HTML/Element/Script】This Boolean attribute is set to indicate to a browser that the script is meant to be executed after the document has been parsed.async的含义【摘自https://deve 阅读全文