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                > 開發時,需要對字符串進行拼接 ``` var a = '1' a += ',2' console.log(a) //1,2 ``` > 去掉最后一個字符串 ``` var obj = {name: "xxx", age: 30, sex: "female"};//定義一個object對象 var str = ''//定義一個空字符用來接收對象里的key或者value for(var item in obj) {//遍歷item變量里的對象的屬性和元素, str += obj[item] + ","//將obj對象的值遍歷出來,并且追加到str字符中。 //str += item + ","//將obj對象的屬性遍歷出來,并且追加到str字符中。 } //第一種方法、將字符串中最后一個元素","逗號去掉, //str = str.substring(0, str.lastIndexOf(',')); //第二種方法、將字符串中最后一個元素","逗號去掉, //str = (str.substring(str.length - 1) == ',') ? str.substring(0, str.length - 1) : str; //第三種方法、將字符串中最后一個元素","逗號去掉, //var str=str.substring(0,str.length-1);//3、將字符串中最后一個元素","逗號去掉, //第四種方法、將字符串中最后一個元素","逗號去掉, var reg=/,$/gi; str=str.replace(reg,""); console.log(str) ```
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