es6-解构赋值(下班后日常学习,给自己看,坚持)
{ let a,b; [a,b]=[1,2]; console.log(a,b); } { let a,b,rest; [a,b,...rest]=[1,2,3,4,5,6]; console.log(a,b,rest); } { let a,b; ({a,b}={a:1,b:2}) console.log(a,b); } { let a,b,c; [a,b,c=3]=[1,2]; console.log(a,b,c); } {//适用于变量交换,不需要中间变量 let a=1; let b=2; [a,b]=[b,a]; console.log(a,b); } {//直接拿到返回值,不需要在用一个变量去保存 function f(){ return [1,2] } let a,b; [a,b]=f(); console.log(a,b); } {//返回多个值的时候,可选择我想要的值 function f(){ return [1,2,3,4,5]; } let a,b; [a,,,b]=f(); console.log(a,b) } {//当不知道返回数组长度的时候,我只想拿第一个,其余保存用于遍历 function f(){ return [1,2,3,4,5]; } let a,b,c; [a,...b]=f(); console.log(a,b); } { let {a=10,b=3}={a:3} console.log(a,b) } { let metaData={ title:'abc', test:[{ title:'test', desc:'description', }] } let {title:esTitle,test:[{title:cnTitle,desc:myDesc}]}=metaData; console.log(esTitle,cnTitle,myDesc) } { let metaData={ title:'abc', test:[{ title2:'test', desc:'description' }] } let {title,test:[{title2,desc}]}=metaData; console.log(title,title2,desc) }优质内容筛选与推荐>>