伪数组怎么转为真正的数组呢~
在用js获取元素对象的时候,很多时候需要进行将伪数组转为真正的数组的,那么如何用呢~~~
废话少说,直接上代码~
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"> <title>test overflow</title> <style type="text/css"> /* 滚动的三要素: 1:父盒子设置width为100%,横向滚动overflow-x: scroll,不换行white-space: nowrap; 2.子元素设置为行内块级元素display: inline-block; */ * { margin: 0; padding: 0; } ul { width: 100%; padding: 20px; border: 1px solid red; overflow-x: auto; white-space: nowrap; } li { display: inline-block; border: 1px solid yellow; padding: 10px 30px; } </style> </head> <body> <ul> <li class="flex" >美妆</li> <li class="flex" >服饰</li> <li class="flex" >衣服</li> <li class="flex" >化妆品</li> <li class="flex" >童装</li> </ul> </body> <script type="text/javascript"> /* 伪数组转为真数组 (1)Array.from(元素对象) (2)Array.prototype.slice.call(元素对象) */ let // 获取li元素 oLi = document.getElementsByClassName('flex') // (1)es6 转为真数组 aLi1 = Array.from(oLi) // (2)es5 转为真数组 aLi2 = Array.prototype.slice.call(oLi) console.log(oLi) console.log(typeof oLi) console.log(aLi1) console.log(aLi2) aLi1.map((item,index,oli) => { console.log(item +'---------------'+index + '------------'+oli) }) // 报错 oLi.map((item,index,oli) => { console.log(item +'---------------'+index + '------------'+oli) }) </script> </html>