Sharing commonly used methods in javascript_javascript skills

In view of the fact that everyone will write some repetitive js processing code in daily development, today I have summarized several common methods to implement it. Get the get request parameters and remove string spaces.

1. Get the parameters in the get request

Js code

function getPara(para){  
  if(location.href.indexOf("?") == -1){  
   // 没有参数，则Do nothing.  
   return null;  
  }  
  else{  
   // 取得GET请求?号后面的字符串  
   var urlQuery = location.href.split("?");  
   if(urlQuery[1].indexOf("&")==-1){//只有一个参数  
    if (urlQuery[1].indexOf("=") == -1) {  
     //没有等号，没有参数，则Do nothing  
     return null;  
    }else{  
     var keyValue = urlQuery[1].split("=");  
     var key   = keyValue[0];  
     var value  = keyValue[1];  
     if(key==para){  
      return value;  
     }  
    }  
   }else{  
    // 解析参数  
    var urlTerms = urlQuery[1].split("&");  
    for (var i = 0; i <urlTerms.length;i++) {  
     var keyValue = urlTerms[i].split("=");  
     var key   = keyValue[0];  
     var value  = keyValue[1];  
     if(key==para){  
      return value;  
     }  
    }  
   }  
  }  
  return null;  
  }  

2. //This function is used to remove the spaces on the left side of the string

Js code

function leftTrim(str) {  
  if (str.charAt(0) == " ") {  
    str = str.slice(1);  
    str = leftTrim(str);  
  }  
   
  return str;  
}  

3. //This function is used to remove the spaces on the right side of the string

Js code

function rightTrim(str) {  
  if (str.length - 1 >= 0 && str.charAt(str.length - 1) == " ") {  
    str = str.slice(0, str.length - 1);  
    str = rightTrim(str);  
  }  
   
  return str;  
} 

4. //Convert time into fixed format for output

Js code

/** 
* 将时间转换成固定格式输出 
* new Date().toFormat('yyyy-MM-dd HH:mm:ss'); 
* new Date().toFormat('yyyy/MM/dd hh:mm:ss'); 
* 只支持关键字（yyyy、MM、dd、HH、hh、mm、ss）HH：表示24小时，hh表示12小时 
*/  
Date.prototype.toFormatString=function(format){  
  var formatstr = format;  
  if(format != null && format != ""){  
    //设置年  
    if(formatstr.indexOf("yyyy") >=0 ){  
      formatstr = formatstr.replace("yyyy",this.getFullYear());  
    }  
    //设置月  
    if(formatstr.indexOf("MM") >=0 ){  
      var month = this.getMonth() + 1;  
      if(month < 10){  
        month = "0" + month;  
      }  
      formatstr = formatstr.replace("MM",month);  
    }  
    //设置日  
    if(formatstr.indexOf("dd") >=0 ){  
      var day = this.getDay();  
      if(day < 10){  
        day = "0" + day;  
      }  
      formatstr = formatstr.replace("dd",day);  
    }  
    //设置时 - 24小时  
    var hours = this.getHours();  
    if(formatstr.indexOf("HH") >=0 ){  
      if(month < 10){  
        month = "0" + month;  
      }  
      formatstr = formatstr.replace("HH",hours);  
    }  
    //设置时 - 12小时  
    if(formatstr.indexOf("hh") >=0 ){  
      if(hours > 12){  
        hours = hours - 12;  
      }  
      if(hours < 10){  
        hours = "0" + hours;  
      }  
      formatstr = formatstr.replace("hh",hours);  
    }  
    //设置分  
    if(formatstr.indexOf("mm") >=0 ){  
      var minute = this.getMinutes();  
      if(minute < 10){  
        minute = "0" + minute;  
      }  
      formatstr = formatstr.replace("mm",minute);  
    }  
    //设置秒  
    if(formatstr.indexOf("ss") >=0 ){  
      var second = this.getSeconds();  
      if(second < 10){  
        second = "0" + second;  
      }  
      formatstr = formatstr.replace("ss",second);  
    }  
  }  
  return formatstr;  
} 

The above is the entire content of this article, I hope you all like it.