Detailed explanation of the method of merging Object values in JavaScript

Main TextPreface:

In daily development work, we may encounter the task of copying all values in JavaScript objects, or it may be a setting merging problem faced when developing a client through electron and making revisions. This article will provide a brief description of a solution to this issue.1Introduction: For example, there is an obj2, obj1, we need to copy obj2All fields in the object that are the same as obj2, and it is necessary to maintain the same field at the same depth in obj2The field structure remains unchanged, you can call the method after that (using ES6Writing style).

Code:

/**
     * Copy the data from src to dist, while retaining the structure of dist
     * @param src
     * @param dist
     */
    copyValue(src, dist) {
      if (!src || typeof(src) !== 'object' || typeof(dist) !== 'object'){
        return ;
      }
      let keys = Object.keys(dist)
      if (keys && keys.length > 0 && isNaN(keys[0])){
        keys.forEach(key => {
          let value = dist[key]
          let srcVal = src[key]
          // Determine if it is an object, if it is, continue to traverse, if not, start assigning or ignoring
          if (value !== undefined && typeof(value) === 'object' && srcVal && typeof(srcVal) === 'object' && srcVal[0] === undefined){
            copyValue(srcVal, value)
          } else if (value !== undefined && srcVal && typeof(value) == typeof (srcVal)){
            // If the source data exists and the types are consistent, then start assigning values
            dist[key] = src[key]
          }
        }
      }
    ,

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