摘要：
forEach不支持break和return。一般普通循环都是用forEach ar arr1=["aa","bb","aa","dd"];arr1.forEach((item,index) => { // console.log("index-> "+index+" item->"+item) i 阅读全文
摘要：
JavaScript删除元素方法 1.根据索引删除数组元素 delete 数组[索引] *注意delete 后面是空格 var arr1=["aa","bb","cc","dd"]; delete arr1[2]; for (var i = 0; i < arr1.length; i++) { co 阅读全文