HTML5+ 学习笔记3 storage.增删改查

//插入N条数据

function setItemFun( id ) {
    //循环插入100调数据
    var dataNum = new Number(id);
    for ( var i=0; i<dataNum; i++ ) {
        plus.storage.setItem( "key"+i, "value"+i );
    }
    var length = getLengthFun();
    outSet( "数据存储成功，存储了"+length+"条数据；" );
}
function getLengthFun(){
    return plus.storage.getLength();
}

//查询所有数据

function getAllItem(){
    outSet( "获取数据：" );
    var itemLength = getLengthFun();
    for ( var i=0; i < itemLength; i++ ) {
        var key = plus.storage.key(i);
          var value = plus.storage.getItem(key);
          outLine( "key:"+key+"-->value:"+value );
    };
}

//删除部分Item

function delItem() {
    outSet( "删除数据：" );
    var itemLength = getLengthFun();
    for (var i=0; i < itemLength; i+=2) {
        var key = plus.storage.key(i);
          plus.storage.removeItem(key);
    };
    var itemNo = getLengthFun();
    outLine( "移除了"+(itemLength-itemNo)+"条数据" );
}

//清除所有内容

function clearAllItem(){
    plus.storage.clear();
    var num = getLengthFun();
    if ( num == 0 ) {
        outSet( "storage数据清除成功！" );
    }else{
        outSet( "storage数据清除失败！" );
    }
}

//修改前五条数据的内容

function modifyTopFive(){
    outSet( "修改前的数据是：" );
    for (var i=0; i < 5; i++) {    
        var key = plus.storage.key(i),value = plus.storage.getItem(key);
          outLine( "key:"+key+"-->value:"+value );
        plus.storage.setItem( key, "新数据值>>"+i );
    };
    outLine( "修改后的数据是：" );
    for (var i=0; i < 5; i++) {
        var key = plus.storage.key(i),value = plus.storage.getItem(key);
        outLine( "key:"+key+"-->value:"+value );
    };
}