JavaScript實(shí)現(xiàn)矩形塊大小任意縮放
最近寫(xiě)了一個(gè)原生JavaScript實(shí)現(xiàn)矩形塊大小任意縮放的案例,感覺(jué)里面的東西比較的繞,這里分享源碼給大家,一起學(xué)習(xí)一下。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>原生JavaScript實(shí)現(xiàn)矩形塊大小任意縮放</title> </head> <style> * { margin: 0; padding: 0; } .box { position: relative; top: 200px; left: 500px; width: 500px; height: 300px; background-color: blueviolet; } .box>div:nth-child(-n+4) { position: absolute; width: 5px; height: 5px; background-color: #cc00ff; } .box>div:nth-child(n+5) { position: absolute; background-color: #f30497; } .box>.dot1 { cursor: nw-resize; top: -5px; left: -5px; } .box>.dot2 { cursor: ne-resize; top: -5px; right: -5px; } .box>.dot3 { cursor: se-resize; bottom: -5px; right: -5px; } .box>.dot4 { cursor: sw-resize; bottom: -5px; left: -5px; } .box>.line1, .box>.line3 { width: 500px; height: 5px; } .box>.line1 { top: -5px; cursor: n-resize; } .box>.line3 { bottom: -5px; cursor: s-resize; } .box>.line2, .box>.line4 { width: 5px; height: 300px; } .box>.line2 { right: -5px; cursor: e-resize; } .box>.line4 { left: -5px; cursor: e-resize; } </style> <body> <div class="box"> <div class="dot1"></div> <div class="dot2"></div> <div class="dot3"></div> <div class="dot4"></div> <div class="line1"></div> <div class="line2"></div> <div class="line3"></div> <div class="line4"></div> </div> <script> //獲取相關(guān)元素節(jié)點(diǎn) let box = document.querySelector(".box"); let dots = document.querySelectorAll(".box>div:nth-child(-n+4)"); let lines = document.querySelectorAll(".box>div:nth-child(n+5)"); // 類(lèi)邊框?qū)挾? let bd = 5; //for循環(huán)指定事件對(duì)象 function changeBox([box, dots, lines, bd]) { for (let i = 0; i < 4; i++) { let { 0: dot1, 1: dot2, 2: dot3, 3: dot4 } = dots; //dots對(duì)象解構(gòu) let { 0: line1, 1: line2, 2: line3, 3: line4 } = lines; //lines對(duì)象解構(gòu) //矩形頂點(diǎn)點(diǎn)擊拖動(dòng)調(diào)整大小 dots[i].onmousedown = function (ev) { //點(diǎn)擊事件初始化相關(guān)值 let oldY = ev.clientY; //頂點(diǎn)原本的y值 let oldX = ev.clientX; //頂點(diǎn)原本的x值 let h = box.clientHeight; //box的高度 let w = box.clientWidth; //box的寬度 let t = box.offsetTop; //box距離頂部的top值 let l = box.offsetLeft; //box距離左邊的left值 window.onmousemove = function (e) { let offsetY = e.clientY - oldY; //鼠標(biāo)移動(dòng)y軸偏移量 let offsetX = e.clientX - oldX; //鼠標(biāo)移動(dòng)x軸偏移量 //if條件是判斷鼠標(biāo)點(diǎn)擊的節(jié)點(diǎn)目標(biāo)對(duì)象 if (i == 0) { box.style.height = `${h - offsetY + bd}px`; //box高度變化 box.style.top = `${t + offsetY - bd}px`; //box的top值變化(定位) box.style.width = `${w - offsetX + bd}px`; //box的寬度變化 box.style.left = `${l + offsetX - bd}px`; //box的left值變化(定位) } else if (i == 1) { box.style.height = `${h - offsetY + bd}px`; box.style.top = `${t + offsetY - bd}px`; box.style.width = `${w + offsetX + bd}px`; } else if (i == 2) { box.style.height = `${h + offsetY + bd}px`; box.style.width = `${w + offsetX + bd}px`; } else if (i == 3) { box.style.height = `${h + offsetY + bd}px`; box.style.width = `${w - offsetX + bd}px`; box.style.left = `${l + offsetX - bd}px`; } //邊框線(xiàn)的高度/寬度隨著box的大小變化而變化 line1.style.width = box.style.width; line2.style.height = box.style.height; line3.style.width = box.style.width; line4.style.height = box.style.height; } } //邊框點(diǎn)擊拖動(dòng)調(diào)整大小 lines[i].onmousedown = function (ev) { //點(diǎn)擊事件初始化相關(guān)值 let oldY = ev.clientY; //頂點(diǎn)原本的y值 let oldX = ev.clientX; //頂點(diǎn)原本的x值 let h = box.clientHeight; //box的高度 let w = box.clientWidth; //box的寬度 let t = box.offsetTop; //box距離頂部的top值 let l = box.offsetLeft; //box距離左邊的left值 window.onmousemove = function (e) { let offsetX = e.clientX - oldX; //鼠標(biāo)移動(dòng)x軸偏移量 let offsetY = e.clientY - oldY; //鼠標(biāo)移動(dòng)y軸偏移量 //if條件是判斷鼠標(biāo)點(diǎn)擊的節(jié)點(diǎn)目標(biāo)對(duì)象 if (i == 0) { box.style.height = `${h - offsetY + bd}px`; box.style.top = `${t + offsetY - bd}px`; } else if (i == 1) { box.style.width = `${w + offsetX + bd}px`; } else if (i == 2) { box.style.height = `${h + offsetY + bd}px`; } else { box.style.width = `${w - offsetX + bd}px`; box.style.left = `${l + offsetX - bd}px`; } //邊框線(xiàn)的高度/寬度隨著box的大小變化而變化 line1.style.width = box.style.width; line2.style.height = box.style.height; line3.style.width = box.style.width; line4.style.height = box.style.height; } } //鼠標(biāo)抬起后清除鼠標(biāo)移動(dòng)事件 window.onmouseup = function () { window.onmousemove = false; } } } changeBox([box, dots, lines, bd]) </script> </body> </html>
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