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HTML5 video 全屏播放调用系统全屏launchFullScreen(element) { if (element.requestFullScreen) { element.requestFullScreen(); } else if (element.mozRequestFullScreen) { element.mozRequestFullScreen(); } else if (element.webk

canvas 透明渐变曲线canvas 画布首先html<canvas id="canvas" width="400" height="300"></canvas>用canvas来实现 window.onload=function(){ var canvas = document.getElementById("canvas");