Javascript 占位符替换

String.prototype.format=function(){
    if(arguments.length===0){
        return String(this);
    }
    let reg=/(\{\d\})/;
    let r=this;
    while(reg.test(r)){
        let index=RegExp.$1.slice(1,-1);
        r = r.replace(new RegExp("\\{"+index+"\\}","g"),(index >= arguments.length)?"":arguments[index]);
    }
    return r;
};

Javascript字符串占位符替换

》"你好,我是{0},今年{2}岁,性别为{1}，测试结束".format('恶魔','男','18')
 《 你好,我是恶魔,今年18岁,性别为男，测试结束