09 2021 档案
摘要：// 第一种 let str = "123*456" let str1 = str.substring(0,str.indexOf("*")) let str2 = str.substring(str1.length+1,str.length) //第二种 let arr = str.split("
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摘要：let str = "" let arr = [{ name:'zs', age:23 },{ name:'ls', age:23 }] for(let i in arr) { str+=arr[i].name + ","; } if(str.length > 0) { str = str.subs
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