小编Ali*_*ier的帖子

任何人都可以向我解释为什么我Uncaught ReferenceError: Invalid left-hand side in assignment在运行以下函数时收到错误消息.

function number(a){
    var last = parseInt(stream.charAt(stream.length-1));
    if(stream === ''){
      stream = a;
    }
    else if(isNumber(last)){
      console.log(last);
      stream.charAt(stream.length-1) = last*10 + a;
    }
    else{
      stream += ' '+a;

    }
    document.getElementById('display').innerHTML = stream;
}