var str = "/1/2/3/4/6666666666";
var index = str .lastIndexOf("\/");  
str  = str .substring(index + 1, str .length);
console.log(str)

 

封装成方法:

  // 封装成方法
        let getVal = (str) => str.substring(str.lastIndexOf('\/')+1 ,str.length)
        console.log(getVal(str));

 

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