array.find()方法

//array.find(function(currentValue, index, arr),thisValue)  方法说明

let tempArray = [

{"key":100,"key2":"sdfsdf"},
{"key":210,"key2":"dfgdg"},
{"key":310,"key2":"sdfsdfbh"},

];

this.tempValue = 210;
let result = tempArray.find(function (item) {
    return item.key == this.tempValue;
},this);

cc.log('---log--- gmk result' + jsonencode(result));

//---log--- gmk result{"key":210,"key2":"dfgdg"}