常用js笔记

• json数组根据某一个字段去重

>
var data = [{name:'Zhangsan',age:'18',wight:'65'},{name:'Lisi',age:'20',wight:'60'},{name:'wangwu',age:'18',wight:'55'},{name:'zhaoliu',age:'20',wight:'58'}];
FilterByName(data, 'age');
function FilterByName(data, Name) {   //data是json对象，Name是根据什么字段去重
    var map = {},
      dest = [];
    for (var i = 0; i < data.length; i++) {
        var ai = data[i];
        if (i == 0) {
            dest.push(ai);
        } else {
            var filterData = dest.filter(function (e) {
                return e[Name] == ai[Name];
            })
            if (filterData.length == 0) {
                dest.push(ai);
            }
        }
    }
    return dest;
}
< (2) [{…}, {…}]
   0: {name: 'Zhangsan', age: '18', wight: '65'}
   1: {name: 'Lisi', age: '20', wight: '60'}
    length: 2