javascript - 只有某些数组值的单个弹出窗口。javascript

Question

嗨，我试图制作一个弹出窗口，其中仅包含数组中大于/小于某个数字的值。我该怎么做呢？

<script>
var moe = [3,3.14,4.3,8,9,19,23,24,46,54,87];
var noe = moe.indexOf(23);

function myFunction()
{
alert(noe);
}
function compare(){
for (var i=0;i<moe.length;i++){
if (moe[i]>10){
alert(moe[i]); 
}
}
}
</script>

Answer 1

让我们来看看这个问题：

1. 给定一个值数组：values = [3,3.14,4.3,8,9,19,23,24,46,54,87];.
2. 我们希望根据大于 10 的值过滤结果。
3. 最后在警报对话框中输出结果（接受一个字符串）。

第一步是进行过滤，然后如何将结果转换为字符串以应用到alert()函数。

(function() {

  var i, len, values, value, results, string_value;

  values  = [3,3.14,4.3,8,9,19,23,24,46,54,87];
  results = []; // Empty array which we will build in order during the filter

  for (i = 0, len = values.length; i < len; i++) {
    value = values[i]; // Not needed; used for readability
    if (value > 10) {
      results.push(value); // Add this value to the results array
    }
  }

  // Now that we have a result lets convert that to a string
  string_value = results.join(", ");

  // And output the result with some string concatenation
  alert("Filtered results: [ " + string_value + " ]");

  // The use of string_value is optional, you could in-line
  // this into the alert line

})();

Answer 2

像这样：

function compare(){
    var out = [];
    for (var i=0;i<moe.length;i++){
        if (moe[i]>10){
            out.push(moe[i]);
        }
    }
    alert(out.join()); 
}