1 1.转字符串:2种 2 1.将数组中每个元素都转为字符串,再用逗号分隔:var str=String(arr); 3 2.将数组中每个元素都字符串,再用自定义下标连接每个元素 4 var str=arr.join("自定义连接符") 5 //无缝拼接 6 var chars=["H","e","l","l","o"]; 7 console.log(chars.join("")); 8 //单词拼接为句子 9 var words=["no","zuo","no","die"]; 10 console.log(words.join(" "));//"空格" 11 //判断是否为空数组 12 var arr=[,,,,,,,,]; 13 console.log(arr); 14 //动态生成页面元素 15 var provs=["北京","南京","上海"]; 16 var html="<option>"+provs.join("</option>")+"</option>"; 17 //设置id为sel的元素开始标签到结束标签之间的内容为html 18 sel.innerHTML="<option>请选择</option>"