截取字符串前几位 var disName ='开心一族漂亮家园';var shortName = disName.substring(0,5);console.log(shortName);//打印结果：开心一族漂 截取字符串后几位 var disName ='开心一族漂亮家园';var disLength = disName.length;var shortName = disName.substring(disLength-2,disLength);console.log(shortName);//打印结果：家园