数组字符串操作

替换掉字符串里所有指定的字符串: swtichParse('abc=def=hjk','||')=>'abc||def||hjk'    ,感觉有几点正则的全局g 

function swtichParse(str,replaceStrting,targetString){
    return str.split(replaceStrting).join(targetString)
}
console.log(swtichParse('abc=def=hjk','=','||'))//abc||def||hjk

替换第一个遇到的目标值

function swtichParse(str,replaceStrting,targetString){
    return str.replace(replaceStrting,targetString)
}
console.log(swtichParse('abc=def=hjk','=','||'))//abc||def=hjk

url解析

var str='http://www.nowcoder.com?key=1&key=2&key=3&test=4#hehe';
function swtichParse(str,name){
    var result={};
    str.replace(/??(w+)=(w+)&?/g,function(s,k,v){
         if(result[k] !== undefined){
            result[k] = [].concat(result[k],v);
        }else{
            result[k] = v;
        }
    })
    if(name){
        return result[name]
    }else{
         return result
    }
}
console.log(swtichParse(str))//{key: Array(3), test: "4"}
console.log(swtichParse(str,'key'))//["1", "2", "3"]
console.log(swtichParse(str,'test'))//4

var arr = [{a:1}, {b:2}, {c: 3}]
var arr2 = [{c:4},{f:6},{u:9}]
//需求：合并两个JSON数组，如果两个数组里有key相同的，arr2里对应的key值覆盖arr里一样的key的值，没有一样的key，就追加到arr数组里
//[{a:1}, {b:2}, {c: 3}]和[{a:4},{f:6},{u:9}]=>output:[{a:4},{b:2}, {c: 3},{f:6},{u:9}]
//[{a:1}, {b:2}, {c: 3}]和[{f:6},{u:9}]=>output:[{a:1}, {b:2},{c: 3},{f:6},{u:9}]
function mergeArray(arr,arr2){
    var arr0=[];
    var keyArr=[];
    var keyVal=[];
    var keyArray=[];
    var keyValue=[];
    for(let i=0;i<arr2.length;i++){
        var obj=arr2[i];
        for(var k in obj){
            keyArr.push(k)
            keyVal.push(obj[k])
        }
    }
    for(let j=0;j<arr.length;j++){
        var obj1=arr[j];
        for(var key in obj1){
            keyArray.push(key)
            keyValue.push(obj1[key])
        }
    }
    for(let i=0;i<keyArray.length;i++ ){
        if(keyArr.indexOf(keyArray[i])!=-1){
            var index=keyArr.indexOf(keyArray[i]);
            keyValue[i]=keyVal[index];
            keyArr.splice(index,1)
            keyVal.splice(index,1)
        }
    }
    for(let i=0;i<keyArr.length;i++ ){
        keyArray.push(keyArr[i])
        keyValue.push(keyVal[i])
    }
    for(let i=0;i<keyArray.length;i++ ){
        var obj={}
        obj[keyArray[i]]=keyValue[i];
        arr0.push(obj)
    }
    return arr0
}
console.log(mergeArray(arr,arr2))