in_array() in javascript finds element value in array

in_array() has the same function as in_array() in php

Js code

//Find element value in array

function in_array(v, a) {  
  var i;  
  for (i = 0; i < a.length; i++) {  
    if (v === a[i]) {  
      return i;  
    }  
  }  
  return -1;  
} // 返回-1表示没找到，返回其他值表示找到的索