这是jquery写的一款找宝藏的游戏，主要是根据位置判断，event.offsetX,event.offsetY的应用，代码如下
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<!DOCTYPE html >
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<html>
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<head>
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<title>find the buried treasure!>
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<script src=""></script>
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</head>
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<body>
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<h1 id="heading">find the buried treasure!>
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<img id="map" width="400" height="400" src="https://www.nostarch.com/images/treasuremap.png"/>
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<p id="distance"></p>
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<script>
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// Get a random number from 0 to size
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var getRandomNumber = function(size){
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return Math.floor(Math.random()*size);
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}
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// Calculate distance between click event and target
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var getDistance = function(event,target){
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var diffX = event.offsetX - target.x;
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var diffY = event.offsetY -target.y;
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//console.log(event.offsetX);
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// console.log(target.x);
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return Math.sqrt((diffX * diffX) + (diffY * diffY));
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};
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// Get a string representing the distance
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var getDistanceHint = function(distance){
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if(distance < 10){
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return "Boiling hot!";
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}else if(distance < 20){
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return "Really hot";
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}else if(distance < 40){
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return "Hot";
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}else if(distance < 80){
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return "Warm";
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}else if(distance < 160){
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return "Cold";
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}else if(distance <320){
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return "Really cold";
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}else{
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return "Freezing!";
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}
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}
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// Set up our variables
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var width = 400;
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var height = 400;
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var clicks = 0;
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// Create a random target location
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var target = {
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x:getRandomNumber(width),
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y:getRandomNumber(height)
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}
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// Add a click handler to the img element
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$("#map").click(function(event){
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clicks++;
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// Get distance between click event and target
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var distance = getDistance(event,target);
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// Convert distance to a hint
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var distanceHint = getDistanceHint(distance);
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// Update the #distance element with the new hint
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$("#distance").text(distanceHint);
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// If the click was close enough, tell them they won
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if(distance < 8){
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alert("Found the treasure in " + clicks + "clicks!");
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}
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});
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</script>
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</body>
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</html>
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