Question

您好我想弄清楚为什么当我更改增量运算符以减少我的javascript private void Create_Table_Values() { string col1 = string.Format("{0} nvarchar(100) PRIMARY KEY", e2pValue_Column_Indx); string col2 = string.Format("{0} nvarchar(100)", e2pValue_Column_Value); string col3 = string.Format("{0} TIMESTAMP DEFAULT CURRENT_TIMESTAMP", e2pValue_Column_TimeStamp ); string sql = string.Format("CREATE TABLE {0} ({1}, {2}, {3})", e2PValue_Table, col1, col2, col3); _ExecuteNonQuery("Create_Table_Values", sql); }文件中的运算符时，当我点击关闭图标时，弹出的窗口不再关闭得到一条错误信息，这只发生在减量运算符 - 增量运算符++工作正常。

**for(var i = 0; i < img.length;i--)**

.myImg {
  border-radius: 5px;
  cursor: pointer;
  transition: 0.3s;
}

.myImg:hover {
  opacity: 0.7;
}


/* The Modal (background) */

.modal {
  display: none;
  /* Hidden by default */
  position: fixed;
  /* Stay in place */
  z-index: 1;
  /* Sit on top */
  padding-top: 100px;
  /* Location of the box */
  left: 0;
  top: 0;
  width: 100%;
  /* Full width */
  height: 100%;
  /* Full height */
  overflow: auto;
  /* Enable scroll if needed */
  background-color: rgb(0, 0, 0);
  /* Fallback color */
  background-color: rgba(0, 0, 0, 0.9);
  /* Black w/ opacity */
}


/* Modal Content (image) */

.modal-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
}


/* Caption of Modal Image */

#caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: #ccc;
  padding: 10px 0;
  height: 150px;
}


/* Add Animation */

.modal-content,
#caption {
  -webkit-animation-name: zoom;
  -webkit-animation-duration: 0.6s;
  animation-name: zoom;
  animation-duration: 0.6s;
}

@-webkit-keyframes zoom {
  from {
    -webkit-transform: scale(0)
  }
  to {
    -webkit-transform: scale(1)
  }
}

@keyframes zoom {
  from {
    transform: scale(0)
  }
  to {
    transform: scale(1)
  }
}


/* The Close Button */

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #f1f1f1;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}

.close:hover,
.close:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}


/* 100% Image Width on Smaller Screens */

@media only screen and (max-width: 700px) {
  .modal-content {
    width: 100%;
  }
}

Answer 1

就像@ user184994所说，你的循环将以这种形式永远运行。 i永远不会超过数组长度。如果您将for循环更改为：

for(var i = img.length - 1; i >= 0; i--){
  //etc
}

它应该像之前一样遍历每个项目，除非现在反过来。

将增量运算符更改为递减运算符后，窗口不会关闭

1 个答案: